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Littérature scientifique sur le sujet « Convective mixers »

Auteur : Grafiati

Publié le 14 décembre 2024

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Articles de revues sur le sujet "Convective mixers"

Shamsoddini, Rahim. « Incompressible SPH Modeling of Rotary Micropump Mixers ». International Journal of Computational Methods 15, n^o 04 (24 mai 2018) : 1850019. http://dx.doi.org/10.1142/s0219876218500196.

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In the present study, for the first time, the flow and mass transfer in the rotary micropump-micromixers were investigated by the SPH method. In fact, the present work shows the ability of the SPH method to model the mixing process due to pumping action. The incompressible SPH method applied for modeling is improved by the kernel gradient corrective tensor, a particle shifting algorithm, and an improved periodic boundary condition. SPH is a proper method for modeling the mixing process because there is no modeling for the convective terms and so, the false diffusion is not observed in the SPH modeling. In the present study, first, a viscous micropump comprising a microchannel in which a circular cylinder rotates with special eccentricity is modeled and validated. Then, the geometry is manipulated in order to achieve a desirable micromixer.

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Chen, Hao, Fangfang Lou, Xueyi Zhang, Chengjun Shen, Weicheng Pan et Shuang Wang. « Hydrothermal Conversion of Microalgae Slurry in a Continuous Solar Collector with Static Mixer for Heat Transfer Enhancement ». Energies 16, n^o 24 (9 décembre 2023) : 7986. http://dx.doi.org/10.3390/en16247986.

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The continuous solar collector is a promising heater and reactor for the hydrothermal liquefaction (HTL) of microalgae biomass. To enhance the heat transfer and hydrothermal conversion of microalgae slurry in solar-driven reactors, a static mixer is inserted in the flow channel of the solar collector. A numerical model combining CFD and HTL reactions of microalgae biomass is proposed. Six composition equations of protein, carbohydrates, lipids, biocrude, aqueous phase and biogas were proposed, while corresponding HTL kinetics were utilized to simulate the conversion rate of the reactants and products. The effects of the twist ratio of the static mixer (3–10), flow rate (30–80 L/h) and solar intensity (650, 750, 850 W/m2) on the flow resistance, heat transfer and organics formation of microalgae slurry were investigated. The swirl flow caused by the static mixer with a twist ratio of three increased the convective heat transfer coefficient (97 W·m−2·K−1) by 2.06 times, while the production rate of biocrude (0.074 g·L−1·s−1) increased by 2.05 times at 50 L/h and 750 W/m2. This investigation gives guidance for utilizing static mixers in solar-driven reactors to optimize the heat transfer and HTL of microalgae biomass with solar heat sources.

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Lebedev, Anatoly, Badma Salaev, Baatr Bolaev, Jury Arylov, Pavel Lebedev et Nikolai Rybalkin. « INTENSIFICATION OF THE PROCESS OF MIXING FEED MIXTURES ». SCIENCE IN THE CENTRAL RUSSIA, n^o 6 (26 décembre 2022) : 50–59. http://dx.doi.org/10.35887/2305-2538-2022-6-50-59.

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The quality and reliability of the technological process of preparing feed mixtures has a significant role both on the properties of the manufactured product and on the productivity of animals. The use of standard mixer designs, as a rule, does not ensure the quality of mixtures, economy, efficiency and leads to an increase in energy costs for the implementation of the technological process. Despite the presence of a wide variety in mixer designs, the need for new mixer developments remains an urgent problem associated with the constant increase in requirements for the uniformity of feed mixtures. When preparing combined feeds of own production, the degree of uniformity should be 90...95%. The study of the mixing process was carried out for a two-shaft bladed mixer of continuous operation. During the research, three variants of the operation of the paddle mixer were considered, differing from each other in the number and size of the blades. The greatest intensity of mixing was in a mixer with smaller blades, but at the same time the segregation period was more than 50%. In all variants, 30...50% of the time is spent on convective mixing. High-quality mixing will be ensured by increasing the number of force impacts of the blades in the elementary mixing zones, which determine the total length of the continuous mixer. A new theoretical dependence of the mixing kinetics in a continuous-action paddle mixer is obtained. The formula shows that increasing the uniformity of the finished feed mixture can be achieved by controlling the mixing process and improving the working bodies of mixers. The efficiency of the mixing process is ensured first by creating a preliminary value of the homogeneity of the mixture Θ0, outside the mixing chamber, and then by varying the mixer parameters to ensure the required quality of the feed mixture. The obtained dependence is the basis for a new method of gravitational mixing and a device for its implementation.

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Yoon, Young Joon, Jae Kyung Choi, Jong Woo Lim, Hyo Tae Kim, Ji Hoon Kim, Youn Suk Choi, Jong Heun Lee et Jong Hee Kim. « Microfluidic Devices Fabricated by LTCC Combined with Thick Film Lithography ». Advanced Materials Research 74 (juin 2009) : 303–6. http://dx.doi.org/10.4028/www.scientific.net/amr.74.303.

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Low temperature co-fired ceramic (LTCC) process combined with thick film photolithography was employed to fabricate ceramic-based microfluidic devices. To check the applicability of novel process, three types of passive mixers, diffusion-driven T-type mixers with different channel width and convection-driven chaotic mixer, were fabricated and their microfluidic performance was evaluated. It was confirmed that the degree of mixing in ceramic-based microfluidic passive mixers was well matched with the numerical simulation data.

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Zhang, Lei, Jiusheng Bao, Qingjin Zhang, Yan Yin, Tonggang Liu et Shan Huang. « Design and Simulation of a Novel Planetary Gear Mixer for Dry Particle Materials ». Recent Patents on Mechanical Engineering 13, n^o 4 (13 octobre 2020) : 387–403. http://dx.doi.org/10.2174/2212797613999200525140019.

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Background: Mixer with excellent performance is the essential premise for high-quality mixture production to ensure uniformity. In the fields of food, pharmacy, powder metallurgy and machinery industry, materials mixing is an indispensable process. At present, the mixing efficiency and performance of the traditional mixer are very low, which has its own limitations, and it is difficult to ensure the quality of the mixture, which seriously affects the safety and reliability of the mixture products such as synthetic drugs, chemical reagents, cement, synthetic fiber, etc. Objective: In order to improve the mixing performance by improving the mixing uniformity, volume utilization, reducing the mixing time and mixing blind area, a novel planetary gear mixer for dry particle materials is designed. Its blades can rotate and the angle of attack can be changed at any time, which realizes the multi-degree of freedom movement of the blades. Methods: Firstly, the shortcomings of three kinds of traditional mixers are compared and analyzed, a novel planetary gear mixer for dry particle is proposed and its structural characteristics are described. Then, the transmission system and blade parameters of the mixer are designed and calculated, and the blade parameters of the mixers are optimized based on ADAMS and EDEM. Finally, the comparative simulation experiment between planetary gear mixers and SHR-10A mixers is carried out. The experiment is used to inquiry on the mixing performance of the new planetary gear mixer. Results: The complementary cycloid was the ideal mixing trajectory of the blade. The most distinctive feature of this motion is that the attack angle of the blade can change in all directions. When the blade parameter p = 11, the Lacey index rises the fastest and the mixing degree is the largest, which indicates that the optimal mathematical model of the blade is ‘y2= 22x’. The comparison with SHR-10A mixer showed that spatial distribution of multi-degree of freedom blades in the new planetary gear mixer has strong dispersion effects on particles and better mixing performance. Conclusion: The planetary gear mixer for dry particle materials is a new type of mixer, which is composed of two sets of blades whose attack angle can be changed at any time. Convection and shear mixing dominate its mixing space, which is conducive to its rapid and full mixing, improving the mixing performance. The dry particle planetary gear mixer for dry particle materials has great developmental value and wide engineering application prospect. In this article, various patents have been discussed.

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Doherty, R. M., D. S. Stevenson, W. J. Collins et M. G. Sanderson. « Influence of convective transport on tropospheric ozone and its precursors in a chemistry-climate model ». Atmospheric Chemistry and Physics 5, n^o 12 (5 décembre 2005) : 3205–18. http://dx.doi.org/10.5194/acp-5-3205-2005.

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Abstract. The impact of convection on tropospheric O3 and its precursors has been examined in a coupled chemistry-climate model. There are two ways that convection affects O3. First, convection affects O3 by vertical mixing of O3 itself. Convection lifts lower tropospheric air to regions where the O3 lifetime is longer, whilst mass-balance subsidence mixes O3-rich upper tropospheric (UT) air downwards to regions where the O3 lifetime is shorter. This tends to decrease UT O3 and the overall tropospheric column of O3. Secondly, convection affects O3 by vertical mixing of O3 precursors. This affects O3 chemical production and destruction. Convection transports isoprene and its degradation products to the UT where they interact with lightning NOx to produce PAN, at the expense of NOx. In our model, we find that convection reduces UT NOx through this mechanism; convective down-mixing also flattens our imposed profile of lightning emissions, further reducing UT NOx. Over tropical land, which has large lightning NOx emissions in the UT, we find convective lofting of NOx from surface sources appears relatively unimportant. Despite UT NOx decreases, UT O3 production increases as a result of UT HOx increases driven by isoprene oxidation chemistry. However, UT O3 tends to decrease, as the effect of convective overturning of O3 itself dominates over changes in O3 chemistry. Convective transport also reduces UT O3 in the mid-latitudes resulting in a 13% decrease in the global tropospheric O3 burden. These results contrast with an earlier study that uses a model of similar chemical complexity. Differences in convection schemes as well as chemistry schemes – in particular isoprene-driven changes are the most likely causes of such discrepancies. Further modelling studies are needed to constrain this uncertainty range.

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Mehrdel, Pouya, Shadi Karimi, Josep Farré-Lladós et Jasmina Casals-Terré. « Novel Variable Radius Spiral–Shaped Micromixer : From Numerical Analysis to Experimental Validation ». Micromachines 9, n^o 11 (27 octobre 2018) : 552. http://dx.doi.org/10.3390/mi9110552.

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A novel type of spiral micromixer with expansion and contraction parts is presented in order to enhance the mixing quality in the low Reynolds number regimes for point-of-care tests (POCT). Three classes of micromixers with different numbers of loops and modified geometries were studied. Numerical simulation was performed to study the flow behavior and mixing performance solving the steady-state Navier–Stokes and the convection-diffusion equations in the Reynolds range of 0.1–10.0. Comparisons between the mixers with and without expansion parts were made to illustrate the effect of disturbing the streamlines on the mixing performance. Image analysis of the mixing results from fabricated micromixers was used to verify the results of the simulations. Since the proposed mixer provides up to 92% of homogeneity at Re 1.0, generating 442 Pa of pressure drop, this mixer makes a suitable candidate for research in the POCT field.

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Doherty, R. M., D. S. Stevenson, W. J. Collins et M. G. Sanderson. « Influence of convective transport on tropospheric ozone and its precursors in a chemistry-climate model ». Atmospheric Chemistry and Physics Discussions 5, n^o 3 (7 juin 2005) : 3747–71. http://dx.doi.org/10.5194/acpd-5-3747-2005.

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Abstract. The impact of convection on tropospheric O3 and its precursors has been examined in a coupled chemistry-climate model. There are two ways that convection affects O3. First, convection affects O3 by vertical mixing of O3 itself. Convection lifts lower tropospheric air to regions where the ozone lifetime is longer, whilst mass-balance subsidence mixes O3-rich upper tropospheric (UT) air downwards to regions where the O3 lifetime is shorter. This tends to decrease UT ozone and the overall tropospheric column of O3. Secondly, convection affects O3 by vertical mixing of ozone precursors. This affects O3 chemical production and destruction. Convection transports isoprene and its degradation products to the UT where they interact with lightning NOx to produce PAN, at the expense of NOx. The combined effect of NOx to PAN conversions and downward transport of lightning NOx results in UT NOx decreases. Convective lofting of NOx from surface sources appears relatively unimportant. Despite UT NOx decreases, UT O3 production increases as a result of UT HOx increases driven by isoprene oxidation chemistry. However, UT O3 tends to decrease, as the effect of convective overturning of O3 itself dominates over changes in O3 chemistry. The changes in tropical UT O3 are transported polewards resulting in a 15% decrease in the global tropospheric O3 burden. These results contrast with an earlier study that uses a model of similar chemical complexity. Differences in chemistry schemes - in particular isoprene-driven changes, as well as differences in convection schemes themselves, are the most likely causes of such discrepancies. Further modelling studies are needed to constrain this uncertainty range.

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Roxburgh, I. W. « Stellar Convective Cores ». Symposium - International Astronomical Union 185 (1998) : 73–80. http://dx.doi.org/10.1017/s0074180900238321.

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The internal structure of stars is governed by hydrostatic support, the distribution of the chemical elements, the transport of energy by radiation and convection, and the liberation of energy by nuclear reactions. The evolution of stars is primarily determined by the changing composition due to the nuclear burning of elements in the central parts of the star, and the redistribution of the products of these reactions by mixing processes. The dominant mixing process is convection: it governs the extent of the mixed cores in moderate and large mass main sequence stars and their subsequent evolution, it mixes nuclear processed material into the envelopes of giants affecting the composition of material ejected into the interstellar medium, thereby affecting the chemical (and luminosity) evolution of galaxies. Understanding convection is essential if one is to understand the evolution of stars. Here I am concerned with convection in stellar cores and in particular with the extension of these cores by the penetration of convective motions into the surrounding stable layers affecting the internal structure and enlarging the chemically mixed region, which in turn affects the subsequent evolution. I briefly discuss a number of approaches to this problem: isochrone fitting of clusters and binary stars; simple theoretical models, the integral constraint, numerical simulation and what we can hope to get from asteroseismological observations of individual stars and of clusters and stellar groups.

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Hu, Huancui, L. Ruby Leung, Zhe Feng et James Marquis. « Moisture Recycling through Pumping by Mesoscale Convective Systems ». Journal of Hydrometeorology 25, n^o 6 (juin 2024) : 867–80. http://dx.doi.org/10.1175/jhm-d-23-0174.1.

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Abstract Moisture recycling, the contribution of local evapotranspiration (ET) to precipitation, has been studied using bulk models assuming a well-mixed atmosphere. The latter is inconsistent with a climatologically stratified atmosphere that slants across latitudes. Reconciling the two views requires an understanding of overturning associated with different weather systems. In this study, we aim to better understand moisture recycling associated with mesoscale convective systems (MCSs). Using a convection-permitting WRF simulation equipped with water vapor tracers (WRF-WVT), we tag moisture from terrestrial ET in the U.S. Southern Great Plains during May 2015, when more than 20 MCS events occurred and produced significant precipitation and flooding. Water budget analysis reveals that approximately 76% of terrestrial ET is advected away from the region while the remaining 24% of terrestrial ET is “pumped” upward within the region, accounting for 12% of precipitation. Moisture recycling peaks during early night hours (1800–2400 LT) due to the mixing of the daytime accumulated ET by active convection. By focusing on five “diurnally driven” MCSs with less large-scale circulation influence than other MCSs during the same period, we find an upright pumping of terrestrial ET at the MCS initiation and development stages, which diverges into two branches during the MCS mature and decaying stages. One branch in the upper level advects the ET-sourced moisture downstream, while the other branch in the mid-to-upper level contributes to the trailing precipitation upstream. Overall, our analysis depicts a pumping mechanism associated with MCSs that mixes local ET vertically, highlighting its specific contributions to enhancing convective precipitation processes.

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Thèses sur le sujet "Convective mixers"

Boussoffara, Hayfa. « Multi-scale powder rheology in convective mixers ». Electronic Thesis or Diss., Ecole nationale des Mines d'Albi-Carmaux, 2024. http://www.theses.fr/2024EMAC0006.

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Comprendre le comportement d'écoulement des poudres lors de l'agitation mécanique est crucial pour optimiser les processus de mélange dans les applications industrielles. Cette étude introduit la rhéologie μ(I), une loi rhéologique développée pour analyser la rhéologie des poudres dans les écoulements denses au sein d'un dispositif de mélange en laboratoire. Le cadre se concentre sur les interactions entre les pales et le lit de poudre, en abordant les défis de mesure de paramètres complexes des poudres tels que le coefficient de friction effectif µeff. La rhéologie μ(I), développée grâce à l'analyse dimensionnelle et à la visualisation des bandes de cisaillement, démontre de fortes capacités prédictives pour différentes configurations de poudres ayant des formes de particules similaires mais des tailles variées. Le cadre de la rhéologie μ(I) s'est révélé applicable à diverses configurations de systèmes agités et a posé les bases des premières études de mise à l'échelle incluant les caractéristiques des poudres. Les comparaisons avec l'équation de Hatano confirment la robustesse de la rhéologie μ(I), notamment pour les lits de poudre profonds. Les améliorations futures se concentreront sur le raffinement de l'évaluation de la largeur des bandes de cisaillement et la réévaluation des hypothèses de contrainte normale pour améliorer la précision du modèle. Cette recherche contribue à une compréhension approfondie de la dynamique des poudres dans les systèmes de mélange et soutient l'efficacité de la mise à l'échelle des processus industriels
Understanding powder flow behaviour during mechanical agitation is crucial for optimising mixing processes in industrial applications. This study introduces μ(I)-rheology, a novel rheological law developed to analyse powder rheology in dense flows within a laboratory mixing setup. The framework focuses on the interactions between paddles and the powder bed, addressing the challenges of measuring complex powder parameters such as the effective friction coefficient µeff. μ(I)-rheology, developed through dimensional analysis and shear band visualisation, demonstrates strong predictive capabilities across different powder configurations with similar particle shapes but varying sizes. The μ(I)-rheology framework proved applicable across various agitated system configurations and has laid the groundwork for initial scale-up studies that includes powder characteristics. Comparisons with Hatano's equation confirm the robustness of μ(I)-rheology, particularly for deep powder beds. Future improvements will focus on refining shear band width evaluation and reassessing normal stress assumptions to enhance model accuracy. This research contributes to a deeper understanding of powder dynamics in mixing systems and supports efficient scaling-up of industrial processes

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Ramesh, Chandra D. S. « Turbulent Mixed Convection ». Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/236.

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Turbulent mixed convection is a complicated flow where the buoyancy and shear forces compete with each other in affecting the flow dynamics. This thesis deals with the near wall dynamics in a turbulent mixed convection flow over an isothermal horizontal heated plate. We distinguish between two types of mixed convection ; low-speed mixed convection (LSM) and high-speed mixed convection (HSM). In LSM the entire boundary layer, including the near-wall region, is dominated by buoyancy; in HSM the near-wall region, is dominated by shear and the outer region by buoyancy. We show that the value of the parameter (* = ^ determines whether the flow is LSM or HSM. Here yr is the friction length scale and L is the Monin-Obukhov length scale. In the present thesis we proposed a model for the near-wall dynamics in LSM. We assume the coherent structure near-wall for low-speed mixed convection to be streamwise aligned periodic array of laminar plumes and give a 2d model for the near wall dynamics, Here the equation to solve for the streamwise velocity is linear with the vertical and spanwise velocities given by the free convection model of Theerthan and Arakeri [1]. We determine the profiles of streamwise velocity, Reynolds shear stress and RMS of the fluctuations of the three components of velocity. From the model we obtain the scaling for wall shear stress rw as rw oc (UooAT*), where Uoo is the free-stream velocity and AT is the temperature difference between the free-stream and the horizontal surface.A similar scaling for rw was obtained in the experiments of Ingersoll [5] and by Narasimha et al [11] in the atmospheric boundary layer under low wind speed conditions. We also derive a formula for boundary layer thickness 5(x) which predicts the boundary layer growth for the combination free-stream velocity Uoo and AT in the low-speed mixed convection regime.

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Ramesh, Chandra D. S. « Turbulent Mixed Convection ». Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/236.

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Kuhn, Simon. « Transport mechanisms in mixed convective flow over complex surfaces ». Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17627.

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Gokhale, Prasad N. « Mixed convective heat transfer and evaporation at the air-water interface ». Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1202500424/.

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Cotton, M. A. « Theoretical studies of mixed convection in vertical tubes ». Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378014.

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Kalapurakal, Dipin. « Numerical Simulation of Magnetohydrodynamic (MHD) Effect on Forced, Natural and Mixed Convection Flows ». University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1342115168.

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Lagana, Anthony. « Mixed convection heat transfer in vertical, horizontal, and inclined pipes ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq29607.pdf.

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Lagana, Anthony. « Mixed convection heat transfer in vertical, horizontal, and inclined pipes ». Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27234.

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An experimental apparatus was designed and constructed for the study of laminar mixed convection heat transfer in vertical, horizontal and inclined tubes. The working fluid was distilled water, with bulk temperatures in the range of 8$ sp circ$C to 31$ sp circ$C.
An innovative design allows, for the first time, flow visualization over the entire heated portion of the test section. The key element of this design is a thin, electrically conductive gold-film heater suitably attached to the outside surface of a plexiglas pipe: the gold film is approximately 80% transparent to electromagnetic radiation in the visible wavelength band. This test section was mounted inside a transparent vacuum chamber to insulate it from the environment. A dye injection technique was used to visualize the mixed-convection flow patterns. The apparatus was also designed and instrumented to allow the measurement of both circumferential and axial temperature variations over the heated tube.
The flow-visualization results revealed the following: (i) a steady recirculating flow pattern, followed by laminar flow instability in vertical tubes; (ii) steady spiralling flow patterns in inclined and horizontal tubes, that confirmed earlier numerical predictions. The temperature results agreed qualitatively with earlier published experimental and numerical data. Local and overall Nusselt numbers can be calculated using the data presented, but this is not within the scope of this thesis.

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Yu, L. S. L. « A computational study of turbulent mixed convection in vertical tubes ». Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493722.

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Livres sur le sujet "Convective mixers"

S, Chen T., Chu Tze Y, American Society of Mechanical Engineers. Winter Meeting et American Society of Mechanical Engineers. Heat Transfer Division., dir. Fundamentals of mixed convection. [New York : American Society of Mechanical Engineers, 1992.

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Kieft, R. Mixed convection behind a heated cylinder. Eindhoven : University of Eindhoven, 2000.

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Petukhov, B. S. Heat transfer in turbulent mixed convection. Sous la direction de Poli͡a︡kov A. F et Launder B. E. New York : Hemisphere Pub. Corp., 1988.

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Dixon, John M., et Francis A. Kulacki. Mixed Convection in Fluid Superposed Porous Layers. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50787-3.

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Hessami, M. A. Mixed convective heat transfer and flow patterns in vertical cylindrical annuli - a parametric study. Kensington, NSW : School of Mechanical and Industrial Engineering, University of New South Wales, 1986.

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Meeting, American Society of Mechanical Engineers Winter. Natural and mixed convection in electronic equipment cooling. New York : American Society of Mechanical Engineers, 1988.

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Shang, De-Yi, et Liang-Cai Zhong. Heat Transfer of Laminar Mixed Convection of Liquid. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27959-6.

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A, Ebadian M., et American Society of Mechanical Engineers. Heat Transfer Division., dir. Fundamentals of forced and mixed convection and transport phenomena. New York : ASME, 1991.

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Kamada, Ray. Amending the w* velocity scale for surface layer, entrainment zone, and baroclinic shear in mixed forced/free turbulent convection. Monterey, Calif : Naval Postgraduate School, 1992.

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Michels, Berenice I. Fluxes of heat and water vapour in a convective mixed layer during EFEDA. Köln : Deutsche Forschungsanstalt für Luft- und Raumfahrt, 1992.

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Chapitres de livres sur le sujet "Convective mixers"

Stull, Roland B. « Convective Mixed Layer ». Dans An Introduction to Boundary Layer Meteorology, 441–97. Dordrecht : Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3027-8_11.

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Ghiaasiaan, S. Mostafa. « Mixed convection ». Dans Convective Heat and Mass Transfer, 367–95. Second edition. | Boca Raton : Taylor & Francis, CRC Press, 2018. | Series : Heat transfer : CRC Press, 2018. http://dx.doi.org/10.1201/9781351112758-11.

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Nield, Donald A., et Adrian Bejan. « Mixed Convection ». Dans Convection in Porous Media, 259–73. New York, NY : Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4757-2175-1_8.

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Nield, Donald A., et Adrian Bejan. « Mixed Convection ». Dans Convection in Porous Media, 397–424. New York, NY : Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5541-7_8.

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Nield, Donald A., et Adrian Bejan. « Mixed Convection ». Dans Convection in Porous Media, 439–71. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49562-0_8.

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Nield, Donald A., et Adrian Bejan. « Mixed Convection ». Dans Convection in Porous Media, 321–43. New York, NY : Springer New York, 1999. http://dx.doi.org/10.1007/978-1-4757-3033-3_8.

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Jamet, Quentin, Etienne Mémin, Franck Dumas, Long Li et Pierre Garreau. « Toward a Stochastic Parameterization for Oceanic Deep Convection ». Dans Mathematics of Planet Earth, 143–57. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-40094-0_6.

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AbstractCurrent climate models are known to systematically overestimate the rate of deep water formation at high latitudes in response to too deep and too frequent deep convection events. We propose in this study to investigate a misrepresentation of deep convection in Hydrostatic Primitive Equation (HPE) ocean and climate models due to the lack of constraints on vertical dynamics. We discuss the potential of the Location Uncertainty (LU) stochastic representation of geophysical flow dynamics to help in the process of re-introducing some degree of non-hydrostatic physics in HPE models through a pressure correction method. We then test our ideas with idealized Large Eddy Simulations (LES) of buoyancy driven free convection with the CROCO modeling platform. Preliminary results at LES resolution exhibit a solution obtained with our Quasi-nonhydrostatic (Q-NH) model that tends toward the reference non-hydrostatic (NH) model. As compared to a pure hydrostatic setting, our Q-NH solution exhibits vertical convective plumes with larger horizontal structure, a better spatial organization and a reduced intensity of their associated vertical velocities. The simulated Mixed Layer Depth (MLD) deepening rate is however too slow in our Q-NH experiment as compared to the reference NH, a behaviour that opposes to that of hydrostatic experiments of producing too fast MLD deepening rate. These preliminary results are encouraging, and support future efforts in the direction of enriching coarse resolution, hydrostatic ocean and climate models with a stochastic representation of non-hydrostatic physics.

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Uddin, Naseem. « Natural and Mixed Convection ». Dans Heat Transfer, 323–60. Boca Raton : CRC Press, 2023. http://dx.doi.org/10.1201/9781003428404-11.

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Moresco, Pablo, et Jonathan J. Healey. « Convective and absolute instability in the mixed convection boundary layer over a vertical flat plate ». Dans Laminar-Turbulent Transition, 339–44. Berlin, Heidelberg : Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-03997-7_50.

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Lai, F. C., F. A. Kulacki et V. Prasad. « Mixed Convection in Saturated Porous Media ». Dans Convective Heat and Mass Transfer in Porous Media, 225–87. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3220-6_8.

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Actes de conférences sur le sujet "Convective mixers"

Rahmani, Ramin K., Anahita Ayasoufi et Theo G. Keith. « Enhancement of Convective Heat Transfer in Internal Viscous Flows by Inserting Motionless Mixers ». Dans ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88103.

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In chemical processing industries, heating, cooling and other thermal processing of viscous fluids are an integral part of the unit operations. Enhancement of the natural and forced convection heat transfer rates has been the subject of numerous academic and industrial studies. Motionless mixers, also known as static mixers, are often used in continuous mixing, heat transfer, and chemical reactions applications. These mixers have low maintenance and operating costs, low space requirements, and have no moving parts. Heat exchangers equipped with mixing elements are especially well suited for heating or cooling highly viscous fluids. Shell and tube heat exchangers incorporate static mixing elements in the tubes to produce a heat transfer rate significantly higher than that of conventional heat exchangers. The mixing elements continuously create a new interface between the working fluid and tube wall, thereby producing a uniform heat history in the fluid. It is desired to employ motionless mixers in heat transfer applications to provide a high rate of heat transfer from a thermally homogenous fluid with low pressure drop. In the past, laboratory experimentation has been a fundamental part of the design process of a new static mixer for a given application as well as the selection of an existing static mixer. It is possible to use powerful computational fluid dynamics (CFD) tools to study the performance of these mixers without resorting to experimentation. In this paper, which is an extension to the previous work of the authors, the enhancement of performance of shell and tube heat exchangers by inserting motionless mixers (SMX and helical) is studied for creeping, laminar, and low-Re turbulent flows. It is shown that the studied mixers produced similar flow histories for the working fluid considered. Both SMX and helical mixers are able to increase thermal performance of heat exchangers. The SMX mixer manifests a higher performance in temperature blending and in heat transfer enhancement compared to the helical mixer. However, the pressure drop created by SMX elements, and consequently the required energy to maintain the flow in tube, is significantly higher.

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Engler, Michael, Norbert Kockmann, Thomas Kiefer et Peter Woias. « Convective Mixing and Its Application to Micro Reactors ». Dans ASME 2004 2nd International Conference on Microchannels and Minichannels. ASMEDC, 2004. http://dx.doi.org/10.1115/icmm2004-2412.

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This work shows the application of convective fluid flow caused by flow-induced secondary vortices to fluidic single-phase micro mixers. As an example we used simple static T-shaped micro mixers. The convective flow was observed both by simulations and by experiments and is suitable for enhancing the mixing quality. Concerning micro reactors, it is necessary that the mixing is faster than the chemical reaction to be induced so that the creation of unwanted side products is minimized. The mixing model by Bourne is slightly modified for continuous flow reactors and applied to our mixers. Using this model, timescales for the mixing in our micro mixers are calculated. A first test reaction — the iodide-iodate reaction by Villermaux and Dushman — to check the validity of the timescales is outlined. These overall results will help to achieve a deeper understanding of micro reactors.

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Fischer, Maximilian, et Norbert Kockmann. « Enhanced Convective Mixing and Residence Time Distribution in Advanced Micromixers ». Dans ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73275.

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Homogeneous mixing of liquids in microchannels is well known and characterized for simple channel geometries, such as Y- or T-shaped mixers. Also meandering mixing channels, in which Dean vortices are generated, are often employed to achieve rapid mixing of liquids. A CFD study was performed to increase the mixing performance in the contacting and first mixing element. Dean vortices in the inlet channels increase the mixing quality for Re numbers in the range from 20 to 200 together with S-shaped mixing elements. Mixing quality is significantly increased by a factor of 2 to more than 5 compared to a T-shaped mixer. The residence time distribution is a further important parameter, which is investigated in this contribution.

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Kockmann, Norbert, Michael Engler, Claus Fo¨ll et Peter Woias. « Liquid Mixing in Static Micro Mixers With Various Cross Sections ». Dans ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1121.

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Micro mixers are an integral part of several micro fluidic devices like micro reactors or analytical equipment. Due to the small dimensions, laminar flow is expected a priori in those devices while the mass transfer is supposed to be dominated by diffusion. A detailed numerical CFD-study by CFDRC-ACE+ of simple static mixers shows a significant deviation from strictly laminar flow in a wide range of Reynolds numbers Re, channel dimensions, and types of cross sections (square, rectangular, trapezoidal). With increasing flow velocity and Re number the flow starts to form vortexes at the entrance of the mixing channel. The vortexes are symmetrical to the symmetry planes of the mixing channel, both for the rectangular and the trapezoidal cross sections investigated here. With further increasing velocity the flow tends to instabilities, which causes a breakup of the flow symmetry. These instabilities are generally found in T-shape mixers with symmetrical flow conditions, but not always in Y-shape mixers or with asymmetrical flow conditions. Within the laminar flow regime diffusive mass transfer is dominant. In this case the mixing quality at constant channel length becomes worse with increasing velocity. This effect can almost be equalized by the onset of the vortex regime, which enhances the mass transfer by convective transport. This paper shows the mixing quality at a certain length for different geometrical parameters and flow conditions.

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Kockmann, Norbert, Michael Engler, Daniel Haller et Peter Woias. « Fluid Dynamics and Transfer Processes in Bended Micro Channels ». Dans ASME 2004 2nd International Conference on Microchannels and Minichannels. ASMEDC, 2004. http://dx.doi.org/10.1115/icmm2004-2331.

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The understanding of the flow processes in microchannels and micro mixers is essential for the design of micro fluidic devices like micro reactors or analytical equipment. We have performed a systematic numerical CFD-study of mixing and mass transfer in sharp 90° bends and heat transfer in T-joints to obtain a detailed insight into the flow patterns and corresponding transfer processes in a wide range of Reynolds numbers. With increasing flow velocity the straight laminar flow starts to form symmetrical vortices in the bend, at the entrance of the mixing channel, and in T-joints. The vortices enhance the transport processes like heat and mass transfer in the channels significantly. The influence of the geometry and the flow conditions is shown by an analytical estimation of the relevant forces. The appearance of convective transport processes is used for the definition of microflows which are controlled by viscous forces and diffusive transfer processes.

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Zhang, Xutao, Jianing Zhao, Fusheng Gao, Jun Gao et Songling Wang. « Numerical Study of Convective Heat Transfer of Multiple Internal Isolated Blocks in an Enclosure ». Dans ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76108.

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The treatment of Convective Heat Transfer Coefficients (CHTCs) in an enclosure has a significant impact on the thermal design of electronic appliance, especially the CHTCs in an enclosure with internal isolated blocks. The CHTCs of the isolated blocks for pure natural convection are usually used, while it may not be applicable to any practice. Combined convective heat transfer, even forced convective heat transfer, is sometime more applicable in reality. In our present work, first of all, validation of the turbulence model for CFD simulation of natural convective flows in a square enclosure is performed. The values of CHTCs for vertical walls obtained by using a low Reynolds k-ε model agree well with the existed correlations. The simulation also indicates that the distance from the first grid to the wall has a significant impact on the CHTCs. Using this low Reynolds k-ε model, computer simulations of natural and forced convective heat transfer within a square enclosure containing ten isolated blocks are performed. For both the natural and forced convection, the dimensionless Nusselt numbers are derived by the obtained results. For the case of mixed convection, the CHTCs are established by blending those for natural and forced convection using the Churchill-Usagi approach, which is a general expression combines the asymptotic solutions of independent CHTCs into the mixed convection by using a Churchill-Usagi blending coefficient.

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Mikhailov, Mikhail D. « Mixed Computation in Transient Heat Convection ». Dans International Symposium on Transient Convective Heat Transfer. New York : Begellhouse, 1996. http://dx.doi.org/10.1615/ichmt.1996.transientconvheattransf.490.

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Chae, Myeong-Seon, et Bum-Jin Chung. « Impairment of Local Heat Transfer of the Turbulent Mixed Convection in a Vertical Flat Plate ». Dans 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82010.

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The heat transfer of the buoyancy-aided turbulent mixed convective flow in a vertical flat plate was investigated experimentally. Mass transfer experiments were carried out based on the heat and mass transfer analogy. The Rayleigh numbers ranged from 1.69 × 108 to 2.11 × 1013, depending on the height of the vertical flat plate. The Reynolds numbers varied from 4,585 to 17,320 for turbulent regimes. The test results for turbulent forced convections agreed well with the forced convection correlations established by Petukhov et al. The local heat transfer rates of the turbulent mixed flow exhibited the impairment of heat transfer compared to the forced convection and non-monotonous behavior along the axial position due to buoyancy effect. The local minimum heat transfer was 38.6% lower than the forced convection heat transfer. The turbulent mixed convection heat transfer is affected by the height of vertical plate.

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« Natural Convection, Mixed Convection ». Dans CONV-09. Proceedings of International Symposium on Convective Heat and Mass Transfer in Sustainable Energy. Connecticut : Begellhouse, 2009. http://dx.doi.org/10.1615/ichmt.2009.conv.470.

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Sakidin, Hamzah, Shah Jahan et Roslinda Mohd Nazar. « Mixed convection flow past through a stretching cylinder with heat generation/absorption and convective boundary condition ». Dans 4TH INTERNATIONAL CONFERENCE ON FUNDAMENTAL AND APPLIED SCIENCES (ICFAS2016). Author(s), 2016. http://dx.doi.org/10.1063/1.4968147.

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Rapports d'organisations sur le sujet "Convective mixers"

Dean, Caryn L. Interactions between a tropical mixed boundary layer and cumulus convection in a radiative-convective model. Office of Scientific and Technical Information (OSTI), mai 1993. http://dx.doi.org/10.2172/10102533.

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Smith, Barton, et Richard Schultz. Transient Mixed Convection Validation for NGNP. Office of Scientific and Technical Information (OSTI), octobre 2015. http://dx.doi.org/10.2172/1226263.

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Campbell, J., et F. Incropera. Experimental study of solidification under mixed convection conditions. Office of Scientific and Technical Information (OSTI), février 1990. http://dx.doi.org/10.2172/7196276.

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Chenoweth, D. R. Mixed-convective, conjugate heat transfer during molten salt quenching of small parts. Office of Scientific and Technical Information (OSTI), février 1997. http://dx.doi.org/10.2172/479182.

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Webb, S. Calculation of natural convection boundary layer profiles using the local similarity approach including turbulence and mixed convection. Office of Scientific and Technical Information (OSTI), juillet 1989. http://dx.doi.org/10.2172/5589306.

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Kobayashi, J., H. Ohshima, H. Kamide et Y. Ieda. Study on mixed convective flow penetration into subassembly from reactor hot plenum in FBRs. Office of Scientific and Technical Information (OSTI), septembre 1995. http://dx.doi.org/10.2172/107779.

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Humphrey, J. A. C., et F. S. Sherman. Experimental study of free and mixed convective flow of air in a heated cavity. Office of Scientific and Technical Information (OSTI), avril 1985. http://dx.doi.org/10.2172/5720207.

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P Symolon, W Neuhaus et R Odell. Mixed Convection Heat Transfer Experiments in Smooth and Rough Verticla Tubes. Office of Scientific and Technical Information (OSTI), décembre 2004. http://dx.doi.org/10.2172/850142.

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Richard W. Johnson. Mixed Convection in the VHTR in the Event of a LOFA. Office of Scientific and Technical Information (OSTI), mai 2012. http://dx.doi.org/10.2172/1048409.

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Wurtz, E., J. M. Nataf et F. Winkelmann. Two- and three-dimensional natural and mixed convection simulation using modular zonal models. Office of Scientific and Technical Information (OSTI), juillet 1996. http://dx.doi.org/10.2172/409881.

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