Готові списки джерел за темами / Heat transfer reduction

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Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Heat transfer reduction"

1

Usui, Hiromoto, and Takashi Saeki. "Drag reduction and heat transfer reduction by cationic surfactants." JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 26, no. 1 (1993): 103–6. http://dx.doi.org/10.1252/jcej.26.103.

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2

FLEISCHMAN, G. J., C. BATOR, R. MERKER, and S. E. KELLER. "Hot Water Immersion To Eliminate Escherichia coli O157:H7 on the Surface of Whole Apples: Thermal Effects and Efficacy." Journal of Food Protection 64, no. 4 (April 1, 2001): 451–55. http://dx.doi.org/10.4315/0362-028x-64.4.451.

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The effect of hot water immersion on both the reduction of Escherichia coli O157:H7 on the apple surface and internal temperatures of the apple was assessed in this study. Microbial reductions were measured experimentally, whereas internal temperatures were calculated through a mathematical analysis of experimental heat transfer data obtained from the apples. A method was developed to provide a purely surface-based inoculation of E. coli O157:H7. Rinsing produced no reduction, and treatments at 80 and 95°C produced reductions of more than 5 logs in 15 s or less. The heat transfer analysis based on experimental data was used to calculate surface heat transfer coefficients and predict temperatures throughout the apple. The analysis indicated a low heat transfer rate. Although it reduces thermal degradation, a low heat transfer rate precludes thermal-based reduction of any internalized microorganisms.
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3

Aguilar, G., K. Gasljevic, and E. F. Matthys. "Coupling Between Heat and Momentum Transfer Mechanisms for Drag-Reducing Polymer and Surfactant Solutions." Journal of Heat Transfer 121, no. 4 (November 1, 1999): 796–802. http://dx.doi.org/10.1115/1.2826068.

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Drag-reducing solutions exhibit simultaneous friction and heat transfer reductions, yet it has been widely believed that there is no direct coupling between the two. In this work, we have conducted a study to re-examine this issue, using measurements of friction and heat transfer over a wide range of flow conditions from onset to asymptotic, various pipe diameters, and several polymer and surfactant solutions. Contrary to some earlier suggestions, our tests show that no decoupling of the momentum and heat transfer mechanisms was seen at the onset of drag reduction, nor upon departure from the asymptotes, but rather that the friction and heat transfer reductions change simultaneously in those regions. For asymptotic surfactant and polymer solutions, the ratio of heat transfer and drag reductions was seen to be constant over a large range of Reynolds numbers, if modified definitions of the reduction parameters are used. In the nonasymptotic region, however, the ratio of heat transfer to drag reductions is higher and is a function of the reduction level, but is approximately the same for polymer and surfactant solutions. This variation is consistent with the concept of a direct coupling through a nonunity constant Prt, as also suggested by our local measurements of temperature and velocity profiles. We also saw that our diameter scaling technique for friction applies equally well to heat transfer. These findings allow us to predict directly the heat transfer from friction measurements or vice versa for these drag-reducing fluids, and also suggest that a strong coupling exists between the heat and momentum transfer mechanisms.
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4

Şahin, Ahmet Z., Davut Kavranoğlu, and Maamar Bettayeb. "Model reduction in numerical heat transfer problems." Applied Mathematics and Computation 69, no. 2-3 (May 1995): 209–25. http://dx.doi.org/10.1016/0096-3003(94)00128-q.

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5

Jordan, L. A., and D. van Vuuren. "Heat-constrained modelling of calcium sulphate reduction." Journal of the Southern African Institute of Mining and Metallurgy 122, no. 10 (November 4, 2022): 1–10. http://dx.doi.org/10.17159/2411-9717/1530/2022.

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A two-dimensional finite difference model has been developed to describe the reduction of kilogram quantities of dehydrated phosphogypsum. The model's scope has been limited to focus on the heat transfer and reactions that occur within a mass of material contained in a vessel inside a furnace rather than also including the effects of heat transfer to the vessel. Changes in the heat transfer properties (k, p, and Cp) are incorporated as the composition of the mass changes as the chemical reactions progress. The model is validated against experimental data, with samples heated to iooo°C at 3°C min-1 while purging with nitrogen gas. A sensitivity analysis of model predictions to the pre-exponential factor of the reaction rate constant of the main chemical reaction and the thermal conductivity of the powder bed indicated that, at the envisaged process conditions, the behaviour of the system depends much more on the rate of heat transfer than on the rate of the chemical reaction. The model demonstrated a significant increase in accuracy when the thermal conductivity was modelled to increase linearly with temperature compared to assuming a constant value.
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6

Zhu, Zhangyu, Juan Li, Hao Peng, and Dongren Liu. "Nature-Inspired Structures Applied in Heat Transfer Enhancement and Drag Reduction." Micromachines 12, no. 6 (June 3, 2021): 656. http://dx.doi.org/10.3390/mi12060656.

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Heat exchangers are general equipment for energy exchange in the industrial field. Enhancing the heat transfer of a heat exchanger with low pump energy consumption is beneficial to the maximum utilization of energy. The optimization design for enhanced heat transfer structure is an effective method to improve the heat transfer coefficient. Present research shows that the biomimetic structures applied in different equipment could enhance heat transfer and reduce flow resistance significantly. Firstly, six biomimetic structures including the fractal-tree-like structure, conical column structure, hybrid wetting structure, scale structure, concave-convex structure and superhydrophobic micro-nano structure were summarized in this paper. The biomimetic structure characteristics and heat transfer enhancement and drag reduction mechanisms were analyzed. Secondly, four processing methods including photolithography, nanoimprinting, femtosecond laser processing and 3D printing were introduced as the reference of biomimetic structure machining. Finally, according to the systemic summary of the research review, the prospect of biomimetic heat transfer structure optimization was proposed.
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7

Trigui, N., and Y. G. Guezennec. "Heat transfer reduction in manipulated turbulent boundary layers." International Journal of Heat and Fluid Flow 11, no. 3 (September 1990): 214–19. http://dx.doi.org/10.1016/0142-727x(90)90039-e.

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8

Liu, Lei, Qiu Yue Guo, Xin Feng Guo, Hui Qing Fan, and Zhu Hai Zhong. "The Effect of Drag-Reducing Polymer on Heat Transfer in Gas-Liquid Two-Phase Flow." Advanced Materials Research 383-390 (November 2011): 856–61. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.856.

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An experimental loop was established with API X52 steel pipes to investigate the effect of drag-reducing polymer on heat transfer in gas-liquid two-phase flow. The inner diameter of the steel pipe is forty millimeter and the test loop has four different test sections such as horizontal, inclined upward, inclined downward and vertical upward sections. The experimental results were presented. The relationship between the drag reduction efficiency and heat transfer reduction was analyzed. When the drag reduction induced by drag-reducing polymer is about 60~70%, the heat transfer between the fluid and the pipe wall obviously decreases. The heat transfer reduction can reach up to 80~90%, which is greater than the drag reduction. A new method is proposed for characterizing the effect of drag reducing polymer on the heat transfer in two-phase flow with Stanton Number.
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9

Baldauf, S., M. Scheurlen, A. Schulz, and S. Wittig. "Heat Flux Reduction From Film Cooling and Correlation of Heat Transfer Coefficients From Thermographic Measurements at Enginelike Conditions." Journal of Turbomachinery 124, no. 4 (October 1, 2002): 699–709. http://dx.doi.org/10.1115/1.1505848.

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Heat transfer coefficients and the resulting heat flux reduction due to film cooling on a flat plate downstream a row of cylindrical holes are investigated. Highly resolved two-dimensional heat transfer coefficient distributions were measured by means of infrared thermography and carefully corrected for local internal testplate conduction and radiation effects. These locally acquired data are processed to lateral average heat transfer coefficients for a quantitative assessment. A wide range variation of the flow parameters blowing rate and density ratio as well as the geometrical parameters streamwise ejection angle and hole spacing is examined. The effects of these dominating parameters on the heat transfer augmentation from film cooling are discussed and interpreted with the help of highly resolved surface results of effectiveness and heat transfer coefficients presented earlier. A new method of evaluating the heat flux reduction from film cooling is presented. From a combination of the lateral average of both the adiabatic effectiveness and the heat transfer coefficient, the lateral average heat flux reduction is processed according to the new method. The discussion of the total effect of film cooling by means of the heat flux reduction reveals important characteristics and constraints of discrete hole ejection. The complete heat transfer data of all measurements are used as basis for a new correlation of lateral average heat transfer coefficients. This correlation combines the effects of all the dominating parameters. It yields a prediction of the heat transfer coefficient from the ejection position to far downstream, including effects of extreme blowing angles and hole spacing. The new correlation has a modular structure to allow for future inclusion of additional parameters. Together with the correlation of the adiabatic effectiveness it provides an immediate determination of the streamwise heat flux reduction distribution of cylindrical hole film-cooling configurations.
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10

von Wolfersdorf, J., R. Hoecker, and C. Hirsch. "A Data Reduction Procedure for Transient Heat Transfer Measurements in Long Internal Cooling Channels." Journal of Heat Transfer 120, no. 2 (May 1, 1998): 314–21. http://dx.doi.org/10.1115/1.2824248.

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The effect of streamwise fluid temperature variation on the local heat transfer coefficient measurements in transient heat transfer tests in long channels is addressed. Previous methods are shown to result in considerable errors. A simplified model is proposed to characterize the local fluid temperature, which drives the heat transfer. With it, analytical solutions for the local wall temperature history are derived, which involve two unknowns, the local heat transfer coefficient and a lumped upstream heat transfer parameter. Using these solutions in the data reduction, these two parameters are determined from surface temperature measurements. Numerical experiments that simulate the physical experiment show the applicability and robustness of the proposed method. The method is finally demonstrated experimentally by investigating heat transfer in a smooth, square duct.
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Дисертації з теми "Heat transfer reduction"

1

Shi, Haifeng. "Surfactant Drag Reduction and Heat Transfer Enhancement." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343664380.

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Maxson, Andrew. "Heat Transfer Enhancement in Turbulent Drag Reducing Surfactant Solutions." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500419520976994.

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Oakes, Brian K. "Reduction of convective heat transfer from reacting flows by application of electric fields." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-08042009-040424/.

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4

Sood, Arun. "A study of drag reduction and convective heat transfer reduction in turbulent flow through pipes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ31534.pdf.

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Parmar, Manjeet Singh. "Fluidized bed combustion of carbons and reduction of NO←x and N←2O." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243062.

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Orchard, D. M. "The near-wall structure of the thermal turbulent boundary layer over riblets." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339557.

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Coetsee, Theresa. "Non-isothermal reaction of iron ore-coal mixtures." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-07092008-142912/.

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8

Eschenbacher, Jens F. "Drag Reduction and Heat Transfer Characteristics of Surfactant-added Flows with Large-scale Longitudinal Vortices." 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/149461.

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9

Qi, Yunying. "Investigation of Relationships among Microstructure, Rheology, Drag Reduction and Heat transfer of Drag Reducing Surfactant Solutions." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1036712806.

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10

Green, Jeffrey Andrew. "IMPROVING THE ENERGY EFFICIENCY OF A MID-SIZE POWER PLANT BY REDUCTION IN AUXILIARY POWER AND IMPROVED HEAT TRANSFER." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1502.

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This study incorporates the potential use of Variable Frequency Drives on various motors as well as areas of improved heat transfer in an older, mid-sized coal fired power plant. In power plants, fluid flow rates are often controlled using dampers or valves while the motors that power the pumps stay at full speed resulting in a significant amount of wasted electrical power; energy is also lost due to poor heat recovery prior to gases leaving the system. By examining pump usage as well as additional heat available for recovery, potential energy savings will be determined. Preliminary results of five motors suggested for variable frequency drive application show annual savings that total 31.1 GWh, resulting in a 1.66% increase in overall plant efficiency. Total project costs are near $2 million resulting in a simple payback period of less than two years assuming 0.04 $/kWh. For every degree reduction of the flue gas temperature by means of heat recovery that is reused elsewhere in the cycle, 2 Billion BTU of coal would be saved annually. One realistic scenario suggested heat recovery resulting in a 120°F degree reduction of flue gas temperature amounting to a 2.54% increase in cycle efficiency.
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Книги з теми "Heat transfer reduction"

1

Hollis, Brian R. User's manual for the One-Dimensional Hypersonic Experimental Aero-Thermodynamic (1DHEAT) data reduction code. Hampton, Va: Langley Research Center, 1995.

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2

Hollis, Brian R. User's manual for the One-Dimensional Hypersonic Experimental Aero-Thermodynamic (1DHEAT) data reduction code. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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3

United States. National Aeronautics and Space Administration., ed. Extinguishment of a diffusion flame over a PMMA cylinder by depressurization in reduced-gravity: Under grant NGT-50862. [Washington, DC: National Aeronautics and Space Administration, 1996.

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4

L, Frost C., Engel Carl D, and George C. Marshall Space Flight Center., eds. SRB ascent aerodynamic heating design criteria reduction study: Final report. [France?: Renault Vehicles Industriels, 1989.

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5

Extinguishment of a diffusion flame over a PMMA cylinder by depressurization in reduced-gravity: Under grant NGT-50862. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Частини книг з теми "Heat transfer reduction"

1

Heß, Markus, and Valentin L. Popov. "Heat Transfer and Heat Generation." In Method of Dimensionality Reduction in Contact Mechanics and Friction, 115–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-53876-6_8.

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2

Gnanasekaran, N., and M. K. Harsha Kumar. "Accelerating MCMC Using Model Reduction for the Estimation of Boundary Properties Within Bayesian Framework." In Numerical Heat Transfer and Fluid Flow, 159–65. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1903-7_19.

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3

Solheim, Asbjørn. "Some Aspects of Heat Transfer Between Bath and Sideledge in Aluminium Reduction Cells." In Light Metals 2011, 381–86. Cham: Springer International Publishing, 2011. http://dx.doi.org/10.1007/978-3-319-48160-9_68.

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Solheim, Asbjørn. "Some Aspects of Heat Transfer Between Bath and Sideledge in Aluminium Reduction Cells." In Light Metals 2011, 381–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118061992.ch68.

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Godfrey, Thomas A., and Gary N. Proulx. "A Heat Transfer Analysis and Alternative Method for Calibration of Copper Slug Calorimeters." In Performance of Protective Clothing and Equipment: 10th Volume, Risk Reduction Through Research and Testing, 42–62. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2016. http://dx.doi.org/10.1520/stp159320160002.

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6

Saravanan, S., K. Nagashetty, G. Jagadeesh, and K. P. J. Reddy. "Experimental investigation of heat transfer reduction using forward facing cavity for missile shaped bodies flying at hypersonic speed." In Shock Waves, 613–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-85168-4_98.

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7

Jonath, Lucas, Jörg Luderich, Jonas Brezina, Ana Maria Gonzalez Degetau, and Selim Karaoglu. "Improving the Thermal Behavior of High-Speed Spindles Through the Use of an Active Controlled Heat Pipe System." In Lecture Notes in Production Engineering, 203–18. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34486-2_16.

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AbstractThe thermo-elastic behavior of high-speed spindles has a significant influence on the machine accuracy. The Tool Center Point (TCP) changes continuously, not only due to the different temperature levels and energy inputs during warm-up, full-load and part-load operation, but also during interruptions for workpiece or tool changes. In this paper a heat pipe based tempering system is presented to control the spindle temperature and thus to keep the TCP displacement at a constant level, regardless of speed and load. As effective passive heat transfer components, heat pipes can be used not only to cool the system but also to insert heat into it. This capability of reversing the heat flow enables a high controllability of the temperature field in a bidirectional way and allows innovative capabilities of using advanced control algorithms. This paper describes the overall heat pipe concept and focuses on its potential as a key element for dynamic temperature control systems. Experimental results prove the feasibility of the concept with a simple on-off controller, achieving the reduction of the TCP displacement variation of a 2.2 kW spindle by 62% of its original value. The potential of the tempering concept forms the base for the deployment of various advanced control systems, such as Model-based Predictive Control (MPC), Fuzzy or Reinforcement Learning.
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8

Kim, Yeowon, Lelani M. Mannetti, David M. Iwaniec, Nancy B. Grimm, Marta Berbés-Blázquez, and Samuel Markolf. "Social, Ecological, and Technological Strategies for Climate Adaptation." In Resilient Urban Futures, 29–45. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63131-4_3.

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AbstractResilient cities are able to persist, grow, and even transform while keeping their essential identities in the face of external forces like climatechange, which threatens lives, livelihoods, and the structures and processes of the urban environment (United Nations Office for Disaster Risk Reduction, How to make cities more resilient: a handbook for local government leaders. Switzerland, Geneva, 2017). Scenario development is a novel approach to visioning resilient futures for cities. As an instrument for synthesizing data and envisioning urban futures, scenarios combine diverse datasets such as biophysical models, stakeholder perspectives, and demographic information (Carpenter et al. Ecol Soc 20:10, 2015). As a tool to envision alternative futures, participatoryscenario development explores, identifies, and evaluates potential outcomes and tradeoffs associated with the management of social–ecological change, incorporating multiple stakeholder’s collaborative subjectivity (Galafassi et al. Ecol Soc 22:2, 2017). Understanding the current landscape of city planning and governance approaches is important in developing city-specific scenarios. In particular, assessing municipal planning strategies through the lens of interactive social–ecological–technological systems (SETS) provides useful insight into the dynamics and interrelationships of these coupled systems (da Silva et al. Sustain Dev 4(2):125–145, 2012). An assessment of existing municipal strategies can also be used to inform future adaptation scenarios and strategic plans addressing extreme weather events. With the scenario development process guiding stakeholders in generating goals and visions through participatory workshops, the content analysis of governance planning documents from the SETS perspective provides key insight on specific strategies that have been considered (or overlooked) in cities. In this chapter, we (a) demonstrate an approach to examine how cities define and prioritize climate adaptation strategies in their governance planning documents, (b) examine how governance strategies address current and future climate vulnerabilities as exemplified by nine cities in North and Latin America where we conducted a content analysis of municipal planning documents, and (c) suggest a codebook to explore the diverse SETS strategies proposed to address climate challenges—specifically related to extreme weather events such as heat, drought, and flooding.
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B. Dehankar, Prashant. "Assessment of Augmentation Techniques to Intensify Heat Transmission Power." In Heat Exchangers. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101670.

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The heat exchanger detects heat between two processes of liquids in the chemical, petrochemical, food, beverage, and hot metals, and so on. Although the required heat transfer calculations and pressure reductions are achieved with a two-pipeline temperature switch (DPHE), the optimization of the heat transfer parameter is used to measure laboratory test settings. This will allow you to build a DPHE model with twisted tapes and mimic the ASPEN PLUS and work it out by trying to scale the lab that has already been produced and standardized for DPHE. Parameter values for this study range from 0.02 kg / sec −0.033 kg / sec as suspension, pressure reduction, and Reynolds numbers. Also to study the mechanism of increased heat transfer by the use of twisted tape with Y1 = 4.3 and Y2 = 7.7 deviations. They are trying to compare the results of a mathematical model with simulation. This mode of inactivity has the effect of equilibrium heat transfer, pressure drop, the collision factor, and the number Reynolds. We tested the modeling and simulation effects and tried to measure the 4 input parameters of the two output parameters: cold flow rate, hot flow rate, cold and cold temperatures. DPHE, therefore, confirmed the flow rates of weight between 0.02–0.07 kg/s with experiments and simulations performed by Aspen Plus.
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ur Rehman, Obaid, Nor Erniza Mohammad Rozali, and Marappa Gounder Ramasamy. "Fouling and Mechanism." In Heat Transfer [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105878.

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Fouling is the deposition of material on the heat transfer surface which reduces the film heat transfer coefficient. The impact of fouling on the heat exchanger is manifested as the reduction of thermal and hydraulic performance, in which the latter has a minor effect. This factor needs to be considered when calculating the effectiveness of the heat exchanger. During the design of heat exchangers, the fouling factor increases the required heat transfer area, which adds extra manufacturing costs. With less efficient heat exchangers, the economic cost of fouling is related to excess fuel consumption, loss of production, and maintenance or cleaning. The extra fuel consumption also damages the environment by increasing greenhouse gas production. Although much of the research work has been done on modeling and predicting fouling, it is still a poorly understood phenomenon representing the complexity of its mechanism. The common fouling mitigation action after the onset of fouling is to optimize the operating condition, e.g., increase the bulk flow velocity or decrease surface temperature. However, many quantitative and semi-empirical models have been developed to predict the fouling rate for preventive actions and optimizing cleaning schedules.
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Тези доповідей конференцій з теми "Heat transfer reduction"

1

Ryzhenkov, A. V., S. I. Pogorelov, N. A. Loginova, A. F. Mednikov, and A. B. Tkhabisimov. "Radiant heat transfer reduction methods in heat insulation of power equipment." In HEAT TRANSFER 2016. Southampton UK: WIT Press, 2016. http://dx.doi.org/10.2495/ht160111.

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Saulnier, Jean-Bernard, P. Merour, and Alain Alexandre. "THERMAL MODELS REDUCTION WHY AND HOW?" In International Heat Transfer Conference 8. Connecticut: Begellhouse, 1986. http://dx.doi.org/10.1615/ihtc8.3440.

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Petit, Daniel, and Richard Pasquetti. "REDUCTION METHOD FOR LINEAR THERMAL PROBLEMS." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.2750.

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Castillo, E. "The temperature reduction of components in the induction hobs of domestic kitchens by numerical and visualization models." In HEAT TRANSFER 2014, edited by M. Miana, L. Sanagustín, I. Hupont, M. Valencia, and S. Aranda. Southampton, UK: WIT Press, 2014. http://dx.doi.org/10.2495/ht140391.

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Fiebig, Martin, Nimai K. Mitra, and Youchang Dong. "SIMULTANEOUS HEAT TRANSFER ENHANCEMENT AND FLOW LOSS REDUCTION OF FIN-TUBES." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.1290.

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Wang, Bo, Vincent M. Wheeler, Johannes Pottas, Peter B. Kreider, and Wojciech Lipinski. "THERMAL MODELLING OF A SOLAR THERMOCHEMICAL REACTOR FOR METAL OXIDE REDUCTION." In International Heat Transfer Conference 16. Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.nee.022948.

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Grosjean, Sébastien, Frédéric Joly, Karine Vera, Alain Neveu, and Eric Monier-Vinard. "REDUCTION OF AN ELECTRONIC CARD THERMAL PROBLEM BY THE MODAL SUB STRUCTURING METHOD." In International Heat Transfer Conference 16. Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.cms.022515.

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Kobayashi, Kenichi, Shota Nakajima, and Yu Kimura. "Drag Reduction of Thermally Stratified Flow in a Horizontal Pipe." In The 15th International Heat Transfer Conference. Connecticut: Begellhouse, 2014. http://dx.doi.org/10.1615/ihtc15.ttr.009892.

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Lemonnier, Denis, Hamou Sadat, and Jean-Bernard Saulnier. "A NEW REDUCTION TECHNIQUE FOR NON LINEAR THERMAL MODELS WITH CONDUCTIVE AND RADIATIVE COUPLINGS." In International Heat Transfer Conference 10. Connecticut: Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.3950.

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10

aus der Wiesche, Stefan. "Heat Transfer and Drag Reduction in Flows Over Riblet Mounted Surfaces." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47356.

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The heat transfer in a channel with its lower wall mounted with streamwise V-shaped riblets is investigated numerically using a LES approach. Both laminar and turbulent flows are considered. At the riblet wall the turbulent drag is reduced by 6% in comparison to the smooth wall, whereas for laminar flow the riblets lead to a significant drag increase. The effect of riblets on heat transfer is investigated explicitly for small Prandtl numbers Pr and an appropriate correlation is derived. This correlation indicates that the Reynolds analogy is not violated in case of Pr = 1 despite the extraordinary turbulent drag reducing mechanism. The numerical results for drag reduction are in good agreement with available experimental and numerical data, and the results are faced with corresponding heat transfer results found in the literature.
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Звіти організацій з теми "Heat transfer reduction"

1

Olsen, Daniel, and Azer Yalin. L52360 NOx Reduction Through Improved Precombustion Chamber Design. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2018. http://dx.doi.org/10.55274/r0011536.

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several objectives were Several objectives were completed. First, a literature review was performed to assess the current technological state of prechambers. This includes state of the art design, reliability surveys, and proven prechamber design criteria. This is an enabling tool for developing new prechamber concepts for year 2 of the project. The prioritized concepts are (in order): - Improved prechamber geometry - apply high speed engine prechamber design and scale up for large bore engines. - Adiabatic prechamber - traditional prechamber will ceramic lining to reduce heat transfer to the prechamber cooling jacket - Natural Gas Reforming - reform prechamber natural gas (roughly 3% of total engine fueling) into CO and hydrogen for low emission, high flame speed ignition. - Micro Prechamber Geometry - non-fueled and fueled micro prechambers for igniting lean engine mixtures with low NOx contribution on engine out emissions (2 concepts). - Develop diagnostic tools to evaluate the performance of prechamber concepts. The tools developed were combustion visualization utilizing high speed cameras, heat release analysis, and spectroscopy.
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Gaul, Chris, and Michael Sheppy. Commercial Refrigeration: Heat Transfer Optimization and Energy Reduction, Measurement and Verification of a Liquid Refrigerant Pump System Retrofit. Office of Scientific and Technical Information (OSTI), March 2016. http://dx.doi.org/10.2172/1243300.

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3

Firon, Nurit, Prem Chourey, Etan Pressman, Allen Hartwell, and Kenneth J. Boote. Molecular Identification and Characterization of Heat-Stress-Responsive Microgametogenesis Genes in Tomato and Sorghum - A Feasibility Study. United States Department of Agriculture, October 2007. http://dx.doi.org/10.32747/2007.7591741.bard.

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Exposure to higher than optimal temperatures - heat-stress (HS) - is becoming increasingly common to all crop plants worldwide. Heat stress coinciding with microgametogenesis, especially during the post-meiotic phase that is marked by starch biosynthesis, is often associated with starch-deficient pollen and male sterility and ultimately, greatly reduced crop yields. The molecular basis for the high sensitivity of developing pollen grains, on one hand, and factors involved in pollen heat-tolerance, on the other, is poorly understood. The long-term goal of this project is to provide a better understanding of the genes that control pollen quality under heat-stress conditions. The specific objectives of this project were: (1) Determination of the threshold heat stress temperature(s) that affects tomato and sorghum pollen quality whether: a) Chronic mild heat stress conditions (CMHS), or b) Acute heat stress (AHS). (2) Isolation of heat-responsive, microgametogenesis-specific sequences. During our one-year feasibility project, we have accomplished the proposed objectives as follows: Objectrive 1: We have determined the threshold HS conditions in tomato and sorghum. This was essential for achieving the 2nd objective, since our accumulated experience (both Israeli and US labs) indicate that when temperature is raised too high above "threshold HS levels" it may cause massive death of the developing pollen grains. Above-threshold conditions have additional major disadvantages including the "noise" caused by induced expression of genes involved in cell death and masking of the differences between heatsensitive and heat-tolerant pollen grains. Two different types of HS conditions were determined: a) Season-long CMHS conditions: 32/26°C day/night temperatures confirmed in tomato and 36/26°C day maximum/night minimum temperatures in sorghum. b) Short-term AHS: In tomato, 2 hour exposure to 42-45°C (at 7 to 3 days before anthesis) followed by transfer to 28/22±2oC day/night temperatures until flower opening and pollen maturation, caused 50% reduced germinating pollen in the heat-sensitive 3017 cv.. In sorghum, 36/26°C day/night temperatures 10 to 5 days prior to panicle emergence, occurring at 35 days after sowing (DAS) in cv. DeKalb28E, produced starch-deficient and sterile pollen. Objective 2: We have established protocols for the high throughput transcriptomic approach, cDNA-AFLP, for identifying and isolating genes exhibiting differential expression in developing microspores exposed to either ambient or HS conditions and created a databank of HS-responsivemicrogametogenesis-expressed genes. A subset of differentially displayed Transcript-Derived Fragments (TDFs) that were cloned and sequenced (35 & 23 TDFs in tomato and sorghum, respectively) show close sequence similarities with metabolic genes, genes involved in regulation of carbohydrate metabolism, genes implicated in thermotolerance (heat shock proteins), genes involved in long chain fatty acids elongation, genes involved in proteolysis, in oxidation-reduction, vesicle-mediated transport, cell division and transcription factors. T-DNA-tagged Arabidopsis mutants for part of these genes were obtained to be used for their functional analysis. These studies are planned for a continuation project. Following functional analyses of these genes under HS – a valuable resource of genes, engaged in the HS-response of developing pollen grains, that could be modulated for the improvement of pollen quality under HS in both dicots and monocots and/or used to look for natural variability of such genes for selecting heat-tolerant germplasm - is expected.
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4

Jebrail, F. F., and R. S. Kistler. L51753 Natural Draft Aerial Coolers. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), January 1996. http://dx.doi.org/10.55274/r0010422.

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In recent years, environmental regulations have tightened and community involvement in environmental issues has increased. The pipeline industry has responded by attempting to reduce the negative economic and environmental impact of conventional air-cooled heat exchangers, which are characterized by high noise levels, excessive energy consumption, and high maintenance costs. While industry has had limited success in reducing air cooler noise using silencers and timed variable-speed fans, these solutions are costly. The most effective noise reduction method is to reduce or eliminate noise at its source. The primary goals of this investigation were to address key technical issues and to document natural draft aerial cooler (NDAC) design knowledge. The following objectives were identified: - Form a project team from PRCI-recommended aerial cooler manufacturers to design a quiet aerial cooler - Conduct technical and economic analyses to determine the actual operating needs and constraints of NDACs - Conduct market analyses to evaluate and identify the marketing issues associated with NDACs - Document the results of the project in a final report In recent years, the number of environmental permits mandating the use of natural draft aerial coolers to reduce noise has increased. Natural draft aerial cooler technology can potentially eliminate noise and improve operational energy efficiency. A broad group of applications could benefit from this technology, including natural gas, engine jacket water, auxiliary water, and engine lube oil cooling. With noise regulations and penalties becoming increasingly stringent, natural draft heat transfer technology is becoming more important. No organization has as yet fully investigated it. The technical and economic feasibility of NDACs were investigated for natural gas, engine jacket water, auxiliary water, and lube oil cooler applications.
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Development of 1.5L Dedicated Hybrid Engine with 42.6% Brake Thermal Efficiency. SAE International, December 2021. http://dx.doi.org/10.4271/2021-01-7031.

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To achieve higher brake thermal efficiency (BTE) and improve vehicle economy, the new development of dedicated hybrid engine (DHE), adopting the Atkinson or Miller cycle, has been becoming the current development trends. A base 1.5L natural aspiration (NA) engine with deep Atkinson cycle has been developed for dedicated hybrid vehicle application, which can achieve the highest BTE of 41.19%. In order to achieve higher BTE, several potential technologies which are easy for mass production application have been studied progressively, such as, higher compression ratio (CR), optimized exhaust gas recirculation (EGR) pick point, lower EGR temperature, higher EGR rate, higher RON number fuels, heat transfer reduction by polishing valve head, light boost, lower viscosity oil. The results show the combined technology application can achieve the highest engine BTE of 42.59%. This paper provides the studied technical routine and the achieved benefits step by step.
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