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Статті в журналах з теми "Confined flow heated from below"
Joo Sik Yoo, Moon-Uhn Kim, and Do H. Choi. "Convective instability of a fluid layer confined in a vertical annulus heated from below." International Journal of Heat and Mass Transfer 31, no. 11 (November 1988): 2285–90. http://dx.doi.org/10.1016/0017-9310(88)90160-3.
Повний текст джерелаKoizumi, Hiroyoshi. "Flow pattern formation and the transition to chaos in a confined container heated locally from below." International Journal of Thermal Sciences 46, no. 10 (October 2007): 953–62. http://dx.doi.org/10.1016/j.ijthermalsci.2006.12.001.
Повний текст джерелаYang, K. T. "Transitions and Bifurcations in Laminar Buoyant Flows in Confined Enclosures." Journal of Heat Transfer 110, no. 4b (November 1, 1988): 1191–204. http://dx.doi.org/10.1115/1.3250620.
Повний текст джерелаPoulikakos, D. "Natural Convection in a Confined Fluid-Filled Space Driven by a Single Vertical Wall With Warm and Cold Regions." Journal of Heat Transfer 107, no. 4 (November 1, 1985): 867–76. http://dx.doi.org/10.1115/1.3247515.
Повний текст джерелаKessler, R. "Nonlinear transition in three-dimensional convection." Journal of Fluid Mechanics 174 (January 1987): 357–79. http://dx.doi.org/10.1017/s0022112087000168.
Повний текст джерелаFerahta, Fatima Zohra, and Cherifa Abid. "Effect of Coupling Radiation Convection on Heat Transfer in the air gap of a Solar Collector." MATEC Web of Conferences 330 (2020): 01018. http://dx.doi.org/10.1051/matecconf/202033001018.
Повний текст джерелаKvarving, Arne Morten, Tormod Bjøntegaard, and Einar M. Rønquist. "On Pattern Selection in Three-Dimensional Bénard-Marangoni Flows." Communications in Computational Physics 11, no. 3 (March 2012): 893–924. http://dx.doi.org/10.4208/cicp.280610.060411a.
Повний текст джерелаMaughan, J. R., and F. P. Incropera. "Secondary flow in horizontal channels heated from below." Experiments in Fluids 5, no. 5 (1987): 334–43. http://dx.doi.org/10.1007/bf00277712.
Повний текст джерелаPrasad, V., F. C. Lai, and F. A. Kulacki. "Mixed Convection in Horizontal Porous Layers Heated From Below." Journal of Heat Transfer 110, no. 2 (May 1, 1988): 395–402. http://dx.doi.org/10.1115/1.3250498.
Повний текст джерелаXia, Chunmei, and Jayathi Y. Murthy. "Buoyancy-Driven Flow Transitions in Deep Cavities Heated From Below." Journal of Heat Transfer 124, no. 4 (July 16, 2002): 650–59. http://dx.doi.org/10.1115/1.1481356.
Повний текст джерелаДисертації з теми "Confined flow heated from below"
Mehta, Sunil. "Pattern Formation in a Confined Porous Medium Heated From Below." Thesis, City University London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529458.
Повний текст джерелаSilano, Gabriella. "Numerical simulations of thermal convection at high Prandtl numbers." Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3211.
Повний текст джерелаIn this thesis we present the results of an extensive campaign of direct numerical simulations of Rayleigh-B\'enard convection at high Prandtl numbers ($10^{-1}\leq Pr \leq 10^4$) and moderate Rayleigh numbers ($10^{5}\leq Pr \leq 10^9$). The computational domain is a cylindrical cell of aspect-ratio (diameter over cell height) $\Gamma=1/2$, with the no-slip condition imposed to the boundaries. By scaling the results, we find a $1/\sqrt{Pr}$ correction to apply to the free-fall velocity, obtaining a more appropriate representation of the large scale velocity at high $Pr$. We investigate the Nusselt and the Reynolds number dependence on $Ra$ and $Pr$, comparing the results to previous numerical and experimental work. At high $Pr$ the scaling behavior of the Nusselt number with respect to $Ra$ is generally consistent with the power-law exponent $0.309$. The Nusselt number is independent of $Pr$, even at the highest $Ra$ simulated. The Reynolds number scales as $Re\sim \sqrt{Ra}/Pr$, neglecting logarithmic corrections. We analyze the global and local features of viscous and thermal boundary layers and their scaling behavior with respect to Rayleigh and Prandtl numbers, and with respect to Reynolds and Peclet numbers. We find that the flow approaches a saturation regime when Reynolds number decreases below the critical value $Re_s\simeq 40$. The thermal boundary layer thickness turns out to increase slightly even when the Peclet number increases. We explain this behavior as a combined effect of the Peclet number and the viscous boundary layer influences. The range of $Ra$ and $Pr$ simulated contains steady, periodic and turbulent solutions. A rough estimate of the transition from steady to unsteady flow is obtained by monitoring the time-evolution of the system until it reaches stationary solutions ($Ra_U\simeq 7.5 \times 10^6$ at $Pr=10^3$). We find multiple solutions as long-term phenomena at $Ra=10^8$ and $Pr=10^3$ which, however, do not result in significantly different Nusselt number. One of these multiple solutions, even if stable for a long time interval, shows a break in the mid-plane symmetry of the temperature profile. The result is similar to that of some non-Boussinesq effects. We analyze the flow structures through the transitional phases by direct visualizations of the temperature and velocity fields. We also describe how the behavior of the flow structures changes for increasing $Pr$. A wide variety of large-scale circulations and plumes structures are found. The single-roll circulation is characteristic only of the steady and periodic solutions. For other solutions, at lower $Pr$, the mean flow generally consists of two opposite toroidal structures; at higher $Pr$, the flow is organized in multi-cell structures extending mostly in the vertical direction. At high $Pr$, plumes detach from sheet-like structures. The different large-scale-structure signatures are generally reflected in the data trends with respect to $Ra$, but not in those with respect to $Pr$. In particular, the Nusselt number is independent of $Pr$, even when the flow structures appear strongly different varying $Pr$. In order to assess the reliability of the data-set we perform a systematic analysis of the error affecting the data. Refinement grid analysis is extensively applied.
---------------------------------------------------------------------------------------- In questa tesi presentiamo i risultati di un'estensiva campagna di simulazioni numeriche dirette della convezione di Rayleigh-B\'enard ad alti numeri di Prandtl ($10^{-1}\leq Pr \leq 10^4$) e moderati numeri di Rayleigh ($10^{5}\leq Pr \leq 10^9$). Il dominio computazionale \`e una cella cilindrica di allungamento (diametro su altezza cella) $\Gamma=1/2$, con condizioni di non-slittamento ai contorni. Scalando i risultati, troviamo una correzione di $1/\sqrt{Pr}$ da applicare alla velocit\`a di caduta libera, ottenendo una rappresentazione pi\`u appropriata della velocit\`a di larga scala ad elevati $Pr$. Investighiamo la dipendenza del numero di Nusselt e del numero di Reynolds da $Ra$ e $Pr$, comparando i risultati con precedenti lavori numerici e sperimentali. Ad elevati $Pr$ il comportamento di scala del numero di Nusselt rispetto a $Ra$ \`e generalmente compatibile con l'esponente di legge di potenza $0.309$. Il numero di Nusselt \`e indipendente da $Pr$, anche per il pi\`u alto $Ra$ simulato. Il numero di Reynolds scala come $Re\sim \sqrt{Ra}/Pr$, a meno di correzioni logaritmiche. Analizziamo le caratteristiche locali e globali degli strati limite viscosi e termici, ed il loro comportamento di scala rispetto ai numeri Rayleigh e Prandtl, e rispetto ai numeri Reynolds e Peclet. Troviamo che il flusso approccia un regime di saturazione quando il numero di Reynolds scende sotto il valore critico $Re_s\simeq 40$. Lo spessore dello strato limite termico comincia a crescere leggermente anche quando in numero di Peclet aumenta. Spieghiamo questo comportamento come un effetto combinato delle influenze del numero di Peclet e dello strato limite viscoso. L'intervallo di $Ra$ e $Pr$ simulato contiene soluzioni stazionarie, periodiche e turbolente. Una stima approssimata della transizione da flusso stazionario a non stazionario \`e ottenuta monitorando l'evoluzione temporale del sistema fino al raggiungimento di soluzioni stazionarie o statisticamente stazionarie ($Ra_U\simeq 7.5 \times 10^6$ a $Pr=10^3$). Troviamo soluzioni multiple come fenomeni di lungo termine a $Ra=10^8$ e $Pr=10^3$ che, comunque, non comportano differenze significative nel numero di Nusselt. Una di queste soluzioni multiple, anche se stabile per un lungo intervallo di tempo, mostra una rottura della simmetria del profilo di temperatura rispetto al piano mediano. Il risultato \`e simile a quello di alcuni effetti di non-Boussinesq. Analizziamo le strutture del flusso nelle fasi di transizione tramite visualizzazioni dirette dei campi di velocit\`a e temperatura. Descriviamo inoltre come il comportamento delle strutture del flusso cambia al crescere di $Pr$. Un'ampia variet\`a di circolazioni di larga scala e strutture a pennacchio vengono trovate. La circolazione a singolo anello \`e caratteristica solo delle soluzioni stazionarie e periodiche. Per le altre soluzioni, a $Pr$ pi\`u bassi, il flusso medio \`e generalmente composto da due strutture toroidali opposte; a $Pr$ pi\`u alti, il flusso \`e organizzato in strutture multi-cellulari che si estendono maggiormente in direzione verticale. Ad alti $Pr$, pennacchi si staccano da strutture simili a fogli. Le impronte delle differenti strutture di larga scala si riflettono generalmente nell'andamento dei dati rispetto a $Ra$, ma non rispetto a $Pr$. In particolare, il numero di Nusselt \`e indipendente da $Pr$, anche quando le strutture del flusso appaiono molto differenti al variare di $Pr$. Per stabilire l'affidabilit\`a dell'insieme dei dati, effettuiamo un'analisi sistematica degli errori a cui i dati sono soggetti. L'analisi di raffinamento della griglia \`e largamente applicata.
XXI Ciclo
1976
Kukrer, Cenk Evren. "Direct Numerical Simulation Of Liquid Flow In A Horizontal Microchannel." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606495/index.pdf.
Повний текст джерелаLiu, Li-kang, and 劉立崗. "Fluid Flow and Heat Transfer from Heated Extended Surfaces with Confined Slot Jet Impingement." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/26334066493416053938.
Повний текст джерела國立清華大學
動力機械工程學系
92
A series of experimental studies on the fluid flow and heat transfer characteristics from unconfined/confined heated smooth or extended surfaces by using different cooling methods have been performed. Two types of cooling methods such as purely natural convection and mixed convection due to slot jet impingement and buoyancy are employed in the present study. The relevant parameters influencing fluid flow and heat transfer performance in natural convection and slot jet impingement studies are listed, respectively. They are: (1) natural convection - the steady-state Grashof number (Grs), ratio of jet separation distance to nozzle width (H/W) and ratio of extended surface height to nozzle width (Hes/W). The ranges of these parameters studied are Grs=3.37x105~1.26x106, H/W=1-10 and Hes/W=0.74-3.40. (2) slot jet impingement - the steady-state Grashof number (Grs), ratio of jet separation distance to nozzle width (H/W), ratio of extended surface height to nozzle width (Hes/W) and jet Reynolds number (ReD). The ranges of these parameters studied are Grs=3.52x105~5.63x105, H/W=1-10, Hes/W=0.74-3.40 and ReD=57-1411. Their effects on fluid flow and heat transfer characteristics in natural convection and slot jet impingement have been systematically explored. For unconfined/confined smooth or extended surfaces with natural convection cooling, the transient-/steady-state local and average heat transfer characteristics are studied. The results manifest that the maximum transient/steady-state local Nusselt number exists in the region near the edge of the heated smooth or extended surface, and the transient/steady-state local Nusselt number decreases along the distance from the surface edge toward the surface center. The transient/steady-state local and average Nusselt number increases with increasing Grs, H/W or Hes/W. The effects of Grs, H/W and Hes/W on the Nuns/Nuns,o distribution are not significant; and the Nuns/Nuns,o distribution can be expressed as a generalized profile, which is independent of Grs, H/W and Hes/W. By the statistical sensitivity analysis of ANOVA F-test, Grs has the most significant effect on steady-state average Nusselt number. In addition, new correlations of steady-state average Nusselt number in terms of relevant influencing parameters for unconfined/confined smooth or extended surfaces are presented. In the hydrodynamic aspect for confined smooth or extended surfaces with slot jet impingement, the fluid flow characteristics including the local mean streamwise velocity distribution, local turbulence intensity distribution, mean streamwise velocity decay and turbulence intensities along jet centerline are investigated. From the results, the local mean streamwise velocity distributions at Z/W=1 are not significantly affected by the H/W for the cases of H/W 8 at low jet Reynolds numbers, say ReD< 910; while they will be close to a uniform profile when the H/W ratio decreases from H/W=8 to H/W=2, especially for the cases at ReD≥ 910. The local mean streamwise velocity distributions at are significantly influenced by Hes/W, and they will become more broadly as the Hes/W ratio increases. Besides, For all the cases without or with a target surface at ReD< 910, the local turbulence intensities at Z/W=1 are less than 5% in the region of 0 x/W< 0.5. As the jet Reynolds number progressively increases to a higher value, say ReD≥ 910, the local turbulence intensities will sharply increase at x/W> 0.3. In the heat transfer aspect for confined smooth or extended surfaces with slot jet impingement, the transient-/steady-state local and average heat transfer characteristics are successively explored. The results reveal that the highest heat transfer during the transient period occurs at the surface center of confined heated smooth or extended surface. The transient local Nusselt number decreases along the distance from the surface center toward the surface edge. As for exploring the effects of Grs, H/W, Hes/W and ReD, the transient/steady-state local and average Nusselt numbers are almost independent of Grs; and they are more significantly affected by ReD and Hes/W as compared with H/W, and increase with increasing ReD or Hes/W. Maximum local and average Nusselt numbers can be found between H/W=3 and H/W=5 for confined smooth surfaces. For confined extended surfaces, the transient/steady-state local and average Nusselt number decrease monotonically with increasing H/W. Furthermore, the effects of Grs, H/W and Hes/W on the Nums/Nums,o distribution are insignificant; and the Nums/Nums,o distribution can be expressed as a generalized profile, which is only dependent of ReD. The Nums/Nums,o distributions will become locally independent and the Nums/Nums,o ratio will keep at unity at ReD=85 and 162 for confined smooth and extended surfaces, respectively. By the statistical sensitivity analysis of ANOVA F-test, ReD has the most significant effect on steady-state average Nusselt number. Finally, two new composite correlations of steady-state average Nusselt number for mixed convection from confined smooth or extended surfaces due to slot jet impingement and buoyancy are presented, respectively.
李岳勳. "Numerical simulation of convective air flow structures in a vertical cylinder heated from below and flow stabilization by axial cylinder rotation." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/55103668235026710359.
Повний текст джерелаShu, Ding-Shi, and 許丁士. "Buoyancy Driven Vortex Flow Patterns in Mixed Convection of Air through a Blocked Horizontal Flat Duct Heated from below." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/37776667551793057755.
Повний текст джерела國立交通大學
機械工程系
89
Buoyancy Driven Vortex Flow Patterns in Mixed Convection of Air through a Blocked Horizontal Flat Duct Heated from below Student: Ding-Shi Shu Advisor: Prof. Tsing-Fa Lin Institute of mechanical Engineering National Chiao Tung University ABSTRACT Experimental flow visualization combined with transient temperature measurement are carried out here to study the possible stabilization of the buoyancy driven vortex flow in mixed convection of air in a bottom heated horizontal flat duct by placing a rectangular solid block on the duct bottom. Two acrylic blocks having dimensions 40x20x5 mm3 (block A) and 40x20x10 mm3 (block B)are tested. The blocks are placed on the longitudinal centerline of the duct bottom at selected locations. How the location and orientation of the rectangular block affect the stability of the vortex flow is investigated in detail. An open loop mixed convective appratus established earlier by Yu et al.[17] was chosen in this investigation and the test section is a high aspect ratio (A=12) rectangular duct. Experiments are conducted for the Reynolds number varying from 3 to 30 and Rayleigh number from 3,000 to 6,000, covering a wide range of the buoyancy-to-inertia ratio. For longitudinal vortex flow, the presence of the blocks placed near the duct entry causes the onset points of the longitudinal rolls to move significantly upstream especially for the roll pair directly behind the block. Besides, the longitudinal vortex flow in the exit portion of the duct is destabilized by the block. The transverse vortex flow is found to be only slightly affected by the block when it is placed in the exit half of the duct. There is significant deformation of the transverse rolls as they pass over the block. However, they restore to their regular shape in a short distance. Significant decay in the flow oscillation is noted in the region right behind the block. Elsewhere the flow oscillates at nearly the same frequency and amplitude as that in the unblocked duct. When the block is placed near the duct entry the vortex flow is significantly changed. Stabilization of the vortex flow behind the block is more pronounced. This flow stabilization is more prominent for block B with its height being twice of block A. Placing the block with its longsides normal to the flow direction can also enhance the flow stabilization. More specifically, behind block B we have steady longitudinal rolls. For mixed vortex flow, placing the block near the duct inlet causes the transverse rolls to change to regular or deformed longitudinal rolls in the duct depending on the buoyancy-to-inertial ratio and orientation of the block. The flow stabilization by the block is substantial. Again the flow stabilization can be enhanced by increasing the block height and placing the block with its longsides normal to the forced flow direction.
wang, Yi-Lung, and 王壹龍. "Vortex Flow and Thermal Characteristics Resulting from a Confined Round Jet of Air Impinging onto a Large Heated Horizontal Disk." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/09323225080355931040.
Повний текст джерела國立交通大學
機械工程系所
96
An experiment is carried out in the present study to investigate the vortex flow patterns resulting from a round air jet impinging over a large confined heated horizontal circular disk of 16 inch in diameter. In the present experiment the jet flow rate is varied from 0.4 to 10.0 (standard liter per minute) for the jet Reynolds number ranging from 27 to 676 with the injection pipe diameter Dj = 20.0 mm and jet-disk separation distance H = 12.5mm and 25.0 mm. The temperature difference between the disk and the air injected at the inlet of the jet is varied from 0 to 14.0℃ for the Rayleigh number Ra ranging from 0 to 7,340. The results from the flow visualization for H=25.0 mm indicate that the vortex flow is characterized by the primary and/or secondary inertia-driven circular rolls along with several buoyancy-driven rolls. The number and strength of the buoyancy induced rolls increase with the buoyancy-to-inertia ratio, which can vary from 1 to 5. Besides, at a low Gr/Rej2 slightly deformed circular buoyancy rolls prevail in the test section. For slightly higher Gr/Rej2 the flow is dominated by the highly deformed curved rolls. The roll pattern becomes somewhat irregular for a further increase in Gr/Rej2 . For all cases examined here the vortex flow is unsteady at long time after the initial transients have died out and is irregular to a certain degree since the buoyancy effect is rather strong for the large impinging plate tested here. In addition to the roll deformation, the mutual pushing, merging and splitting of the buoyancy rolls occur nonperiodically in time. This unsteady and irregular vortex flow is also reflected in the data for the air temperature variations with time. Some quantitative buoyancy-driven vortex flow characteristics such as the size and location of the buoyancy rolls are summarized and correlated empirically. Moreover, a flow regime map is provided to delineate various induced vortex flow patterns and the boundaries separating various vortex flow patterns are also correlated empirically. When the jet-disk separation distance is reduced to 12.5 mm for ΔT varied from 8.0℃ to 14.0℃ ( corresponding to the Rayleigh number ranging from 1,470 to 2,670 ), circular waves traveling in the radial direction and radial vortex rolls appear in the confined impinging jet flow. These waves are somewhat deformed and are not axisymmetric. The radial rolls originate in the stagnation region of the impinging jet and grow in size in the radial direction. The size of the radial rolls is also nonuniform in the circumferential direction. Besides, the moving waves and radial rolls can coexist in the flow. Moreover, the ranges of the jet Reynolds number and Rayleigh numbers leading to the new vortex flow patterns are determined. Flow regime maps delineating various vortex flow patterns including all inertia- and buoyancy-driven roll and wave patterns found here are given. And the boundaries among various vortex flow patterns are empirically correlated.
Wu, Jia-Hong, and 吳佳鴻. "Characteristics of Unstable Vortex Flow Resulting from a Round Jet of Air Impinging onto a Heated Horizontal Disk Confined in a Vertical Cylindrical Chamber." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/2x3f86.
Повний текст джерела國立交通大學
機械工程系所
92
An experiment combining flow visualization and temperature measurement is carried out in the present study to investigate the possible presence of new inertia-driven vortex rolls and some unique characteristics of the time-dependent mixed convective vortex flow resulting from a high speed round air jet impinging onto a heated horizontal circular disk in a vertical cylindrical chamber. The flow photos taken from the side and top views of the vortex flow in the chamber aim to unravel these new vortex flow characteristics. In the present experiment the jet-to-disk separation distance is varied from 10.0 to 30.0 mm and the jet flow rate is varied from 0 to 12.0 slpm (standard liter per minute) for the jet Reynolds number Rej ranging from 0 to 1,623. The temperature difference between the disk and the air injected into the chamber is varied from 0 to 25.0℃ for the Rayleigh number Ra ranging from 0 to 63,420. The results from the flow visualization clearly show that at sufficiently high Rej the inertia-driven tertiary and quaternary rolls can be induced. At even slightly higher Rej the vortex flow becomes unstable due to the inertia-driven flow instability. Only for H=20.0 mm the flow is subjected to the buoyancy-driven instability. Because of the simultaneous presence of the inertia- and buoyancy-driven instabilities, a reverse flow transition can take place in the chamber with H=20.0 mm. At the large H of 30.0 mm the flow unsteadiness results from the mutual pushing and squeezing of the inertia- and buoyancy-driven rolls since they are relatively large and contact with each other. It is also noted that the critical jet Reynolds number for the onset of tertiary and quaternary rolls increase with for H=10.0 & 20.0 mm. But for H=30.0 mm the opposite is true, indicating that raising can destabilize the vortex flow.
Lo, Wen-Hsien, and 羅文賢. "Suppression of Vortex Flow Resulting from a Round Jet of Air Impinging onto a Heated Horizontal Disk Confined in a Vertical Cylindrical Chamber by Disk Rotation." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/49780753298375342957.
Повний текст джерела國立交通大學
機械工程系所
93
An experiment combining flow visualization and temperature measurement is carried out in the present study to explore the possible suppression of the buoyancy-driven stable and unstable vortex flow resulting from a round jet of air impinging onto a heated horizontal disk in a vertical cylindrical chamber by the disk rotation. In this study the experiment is mainly conducted for the jet flow rate varied from 0 to 12.0 slpm (standard liter per minute) with two different injection pipes (diameter 10.0 and 22.1 mm) and the temperature difference between the disk and the air injected into the chamber is varied from 0 to 25.0℃ at a fixed jet-to-disk separation distance of 20.0 mm. The disk rotation speed is varied from 0 to 50 rpm. Thus the jet Reynolds number, Rayleigh number and rotational Reynolds number range respectively from 0 to 1,623, from 0 to 18,790, and from 0 to 3,892. The results from the flow visualization clearly show that typically the steady mixed convective air jet impinging onto the rotating disk consists of three circular vortex rolls. The inner vortex roll is generated by the deflection of the impinging jet at the disk surface and hence termed as the inertia-driven vortex roll. The middle vortex roll is mainly formed by the centrifugal pumping action produced by the disk rotation and hence termed as the rotation-induced roll. The buoyancy-induced vortex roll resulting from the temperature difference between the heated disk and the inlet air prevails in the outer zone of the processing chamber. At a high disk rotation rate, the buoyancy roll can be significantly suppressed and even wiped out by the disk rotation. Besides, the primary inertia-driven roll is stretched out to become slender and weaker. Moreover, the inertia-driven secondary, tertiary, and quaternary rolls dominated at high Rej can be entirely wiped out. We further note that the disk rotation can effectively suppress the inertia-driven and/or buoyancy-driven time-dependent and nonperiodic vortex flows. The unstable vortex flows can be completely stabilized by the disk rotated at a high speed and the flows become steady. The disk rotation can also reduce the radial temperature variation in the flow and significantly delay the onset of the buoyancy-driven roll. Based on the present data, a flow regime map is provided to delineate the the axisymmetric and nonaxisymmetric vortex flows with various disk rotation rates for H=20.0 mm.
Частини книг з теми "Confined flow heated from below"
Gholijani, Alireza, Sebastian Fischer, Tatiana Gambaryan-Roisman, and Peter Stephan. "High Resolution Measurements of Heat Transfer During Drop Impingement onto a Heated Wall." In Fluid Mechanics and Its Applications, 291–310. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09008-0_15.
Повний текст джерелаWarrick, Arthur W. "Saturated Flow." In Soil Water Dynamics. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195126051.003.0008.
Повний текст джерелаWhiteman, C. David. "Diurnal Mountain Winds." In Mountain Meteorology. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195132717.003.0019.
Повний текст джерелаErman, Burak, and James E. Mark. "Critical Phenomena and Phase Transitions in Gels." In Structures and Properties of Rubberlike Networks. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195082371.003.0009.
Повний текст джерела"* ** Fig. 39 Cyclone-type homogenizer mixing chamber. (From Ref. 41.) chamber. The symmetry axes of these entry ports are perpendicular to the symmetry axis of the interaction chamber. This design is presented in Fig. 40, with only four entry ports. This machine is called Novamix® (a registered name for Micro Vesicular Sys-tems). It was originally designed to process and produce nonphospholipid lamellar mi-crostructures or lipid vesicles. The lipid vesicles are composed of two immiscible aqueous and lipid phases. The lipid phase consists, generally, of solid polyoxyethylene-derived amphiphiles that form micelles in aqueous media. Under the proper mixing conditions, i.e., a combination of shear, heat, and turbulence, followed by appropriate cooling, the micelles of these types of lipids fuse to form lipid vesicles. The two phases are metered carefully and heated in separate reservoirs and finally pumped to the interaction chamber for pro-cessing. The interaction chamber and pump heads are confined in an insulated com-partment that is maintained at the required temperature for the production of the lipid vesicles. The outlet is attached to a chilling device that cools the product at the required rate [43]. The flow pattern is similar to that of a cyclone, i.e., the flow of liquid is in a vertically positioned rotating cylinder along its vertical axis. The streamlines are con-centric circles with their radii decreasing toward the center of the cylinder. The de-crease is a function of cylinder radius, flow rate of fluid (speed of rotation), and other parameters like viscosity, density, and surface tension of the formulation. In curved type of flow with changing radii, there exists a pressure gradient, i.e. dPIdr = V /r (8) where P = pressure; r = vessel (interaction chamber) radius; V = tangential linear velocity; and p= the liquid density. Since the change in pressure is positive for a positive radius change, the pressure at successive points increases from the concave to the convex side of the streamline [39]. The exact change in pressure depends on the variation in tangential linear velocity, which is proportional to the speed of the rotation and the ra-dius. The flow pattern in the interaction chamber is neither a free vortex, due to the presence of an initial momentum from the pumps, nor a forced vortex, for the stream-." In Pharmaceutical Dosage Forms, 368–69. CRC Press, 1998. http://dx.doi.org/10.1201/9781420000955-55.
Повний текст джерела"measurements. This paper is confined to the different forms of sampling odourous gases for olfactometric measurements and the problems involved. It refers to existing guidelines for olfactometric measurements in the countries of the EEC, as well. 2. TYPES OF SAMPLING Samples of odourous gas may be collected in unconcentrated or concentrated form. Concentrated sampling is usually neces sary when gas chromatography or other chemical analytical meth ods are to be used. Unconcentrated sampling is provided if o-dour threshold concentrations are required (2). Depending on the type of olfactometer used dynamic sam pling or static sampling are provided. The principle of dynam ic sampling is shown in Figure 1. It requires a part-flow of the odourous gas to be continoulsy extracted from the source and subsequently directed to the olfactometer. This sampling method implies that the measurements are carried out close to the source. An advantage of the method is that there is the possibility of controlling a process, directly, and in case of the break-down of the process this can be noticed right away. A disadvantage of the dynamic method is that odour sources that are not readily accessible require a relatively great ef fort in order to install the olfactometer and suitable sam pling pipes which often should be insulated or heated to avoid adsorption or condensation (3). When static sampling is used a partial stream of the o-dourous air is collected in a sampling vessel. Samples are taken from this vessel or bag to dilute the odourous air for the olfactometer using syringes or on-line tubings. When using this method odour measurement with the panel can be carried out at any arbitrary location, if the vessel is a transport able one. An example for static sampling is given in Figure 2. 3. PROBLEMS OF SAMPLING the main problems encountered when sampling odourous air derive from surface effects of the sampling tubes and vessels, namely by - adsorption, - desorption, and - condensation. This depends mainly on the material of the tube, the vessel or the bag (adsorption) or on the nature of the gas, whether it is hot and/or containes a high amount of humidity (condensa tion). On the other hand the sample can be altered by trace components bleeding from the material of the walls of the ves sel or the tube (desorption). The following factors are to be observed for valid static sampli ng. aTTTToTce of_m£teri aj_ For tWe sampling of odourous gases glas vessels, stain less steel tanks (4) and flexible plastic bags (5) were tested. The initial concentrations of the test gases decrease consider ably with storage time in glass and steel vessels. In recent years bags made of Polyethylene(6), Teflon (3) and Tedlar (7), (8) were usually used. Figure 3 shows a graph from SCHUETZLE." In Odour Prevention and Control of Organic Sludge and Livestock Farming, 59. CRC Press, 1986. http://dx.doi.org/10.1201/9781482286311-18.
Повний текст джерелаТези доповідей конференцій з теми "Confined flow heated from below"
Ridouane, El Hassan, and Antonio Campo. "Time-Depending Pitchfork Bifurcation in the Thermal Convection Flow Confined to an Isosceles Triangular Cavity Heated from Below." In 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-3776.
Повний текст джерелаBagchi, Aniruddha, and Francis A. Kulacki. "Natural Convection in Horizontal Fluid-Superposed Porous Layers Heated Locally From Below." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39604.
Повний текст джерелаLi, Yanjun, Ya-Ting T. Liao, and Paul Ferkul. "Concurrent-Flow Flame Spread Over a Thin Solid in a Narrow Confined Space in Microgravity." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11908.
Повний текст джерелаKruger, Sunita, and Leon Pretorius. "Numerical Investigation of Natural Convection in a Mono-Span Greenhouse." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82365.
Повний текст джерелаChoi, Chang K., and MinChan Kim. "BUOYANCY EFFECTS IN PLANE COUETTE FLOW HEATED UNIFORMLY FROM BELOW." In International Heat Transfer Conference 10. Connecticut: Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.3230.
Повний текст джерелаRhee, Hyop S., Christopher J. Freitas, and Robert L. Street. "Experimental and Numerical Investigation of a Natural Convection Flow Heated from Below." In International Heat Transfer Conference 8. Connecticut: Begellhouse, 1986. http://dx.doi.org/10.1615/ihtc8.2810.
Повний текст джерелаRemillieux, Marcel C. "Experimental Study on the Stabilization of the No-Motion State in the Rayleigh-Benard Convection Problem." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16350.
Повний текст джерелаChoi, C. K., С B. Shin, and S. T. Hwang. "THERMAL INSTABILITY IN THERMAL ENTRANCE REGION OF PLANE COUETTE FLOW HEATED UNIFORMLY FROM BELOW." In International Heat Transfer Conference 8. Connecticut: Begellhouse, 1986. http://dx.doi.org/10.1615/ihtc8.2870.
Повний текст джерелаGolob, Matthew, Clayton Nguyen, Sheldon Jeter, and Said Abdel-Khalik. "Solar Simulator Efficiency Testing of Lab-Scale Particle Heating Receiver at Elevated Operating Temperatures." In ASME 2016 10th International Conference on Energy Sustainability collocated with the ASME 2016 Power Conference and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/es2016-59655.
Повний текст джерелаSa´nchez, F., F. Solorio, and Ruben A´vila. "Conjugate Natural Convection in a Square Cavity Heated From Below." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59463.
Повний текст джерелаЗвіти організацій з теми "Confined flow heated from below"
Lahav, Ori, Albert Heber, and David Broday. Elimination of emissions of ammonia and hydrogen sulfide from confined animal and feeding operations (CAFO) using an adsorption/liquid-redox process with biological regeneration. United States Department of Agriculture, March 2008. http://dx.doi.org/10.32747/2008.7695589.bard.
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