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Letteratura scientifica selezionata sul tema "Forced convection boiling"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 8 febbraio 2022

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Articoli di riviste sul tema "Forced convection boiling"

1

Ji, Wang, Liu Yujun, Ji Zhuoshang, Deng Yanping e Zhang Jun. "Study on Forced Convection Boundary Condition for Subcooled Water in the Simulation of Line-Heating Process". Journal of Ship Production 22, n. 01 (1 febbraio 2006): 41–47. http://dx.doi.org/10.5957/jsp.2006.22.1.41.

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In the simulation of line-heating process, the convection boundary condition, especially the subcooled water forced convection, has great influence on the result. The calculation of the convection coefficient is a difficult problem in the simulation. This paper uses the theory of forced convection boiling to study subcooled water forced convection during the line-heating process. By solving the wall temperatures of originating nucleate boiling and critical heat flux for subcooled water and comparing the plate temperature with these two wall temperatures, the status of water can be determined, and then the corresponding convection coefficient is calculated. The simulation results show that the precision of the forced convection boiling boundary condition presented in this paper is much better than that of a boundary condition based on the pool boiling curve.

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2

Auracher, H. "Forced convection transition boiling of refrigerants". International Journal of Refrigeration 11, n. 5 (settembre 1988): 329–35. http://dx.doi.org/10.1016/0140-7007(88)90097-7.

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3

Zeng, L. Z., e J. F. Klausner. "Nucleation Site Density in Forced Convection Boiling". Journal of Heat Transfer 115, n. 1 (1 febbraio 1993): 215–21. http://dx.doi.org/10.1115/1.2910651.

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Measurements of nucleation site density, n/A, have been obtained for forced convection boiling of refrigerant R113 in a horizontal 25 × 25 mm i.d. square transparent test section with a nichrome heating strip. It has been found that the behavior of the nucleation site density is significantly different from that found in pool boiling. The mean vapor velocity, heat flux, and system pressure appear to exert a strong parametric influence. It is demonstrated that although the nucleation site density is dependent on the critical cavity radius, rc, it is not sufficient for correlating n/A.

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4

Podowski, Michael Z., e Raf M. Podowski. "Mechanistic Multidimensional Modeling of Forced Convection Boiling Heat Transfer". Science and Technology of Nuclear Installations 2009 (2009): 1–10. http://dx.doi.org/10.1155/2009/387020.

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Due to the importance of boiling heat transfer in general, and boiling crisis in particular, for the analysis of operation and safety of both nuclear reactors and conventional thermal power systems, extensive efforts have been made in the past to develop a variety of methods and tools to evaluate the boiling heat transfer coefficient and to assess the onset of temperature excursion and critical heat flux (CHF) at various operating conditions of boiling channels. The objective of this paper is to present mathematical modeling concepts behind the development of mechanistic multidimensional models of low-quality forced convection boiling, including the mechanisms leading to temperature excursion and the onset of CHF.

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5

MURATA, Keiji, e Kenichi HASHIZUME. "Forced convection boiling of non-azeotropic mixtures." Transactions of the Japan Society of Mechanical Engineers Series B 54, n. 506 (1988): 2856–63. http://dx.doi.org/10.1299/kikaib.54.2856.

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6

NAKAYAMA, Akira, e Hitoshi KOYAMA. "Forced convection film boiling on a wedge." Transactions of the Japan Society of Mechanical Engineers Series B 51, n. 472 (1985): 4334–36. http://dx.doi.org/10.1299/kikaib.51.4334.

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7

Vasil'yev, A. A. "Heat Transfer in Forced-Convection Film Boiling". International Journal of Fluid Mechanics Research 22, n. 2 (1995): 66–72. http://dx.doi.org/10.1615/interjfluidmechres.v22.i2.40.

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8

Sivagnanam, P., A. R. Balakrishnan e Y. B. G. Varma. "Forced convection subcooled boiling of binary mixtures". Canadian Journal of Chemical Engineering 70, n. 1 (febbraio 1992): 42–47. http://dx.doi.org/10.1002/cjce.5450700107.

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9

Chappidi, P. R., F. S. Gunnerson e K. O. Pasamehmetoglu. "A simple forced convection film boiling model". International Communications in Heat and Mass Transfer 17, n. 3 (maggio 1990): 259–70. http://dx.doi.org/10.1016/0735-1933(90)90091-w.

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10

Klausner, J. F., R. Mei, D. M. Bernhard e L. Z. Zeng. "Vapor bubble departure in forced convection boiling". International Journal of Heat and Mass Transfer 36, n. 3 (febbraio 1993): 651–62. http://dx.doi.org/10.1016/0017-9310(93)80041-r.

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Più fonti

Tesi sul tema "Forced convection boiling"

1

Aziz, S. "Forced convection film boiling on spheres". Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371536.

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2

Hama, Katsuhiko. "Film boiling heat transfer in various liquids under natural convection and forced convection conditions". Kyoto University, 2006. http://hdl.handle.net/2433/143793.

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3

Doder, Dejan. "Experimental analysis of the pressure characteristic curve of a forced convection boiling flow in single horizontal channel". Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20917.

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Abstract (sommario):

Forced convection boiling flow, often referred to as two-phase flow, is a common phenomenon which occurs in many industrial processes. The relationship between the total pressure drop in a channel containing two-phase flow and the mass flux of the flow is known as the pressure characteristic curve. If any part of pressure characteristic curve contains a negative slope, flow instabilities might occur in the channel. Flow instabilities are unwanted because they can reduce the efficiency of the industrial process. In this study experimental work has been done to analyze the behavior of the pressure characteristic curve in two-phase flow by applying a sensitivity analysis. The parameters which were analyzed in the sensitivity analysis were inlet pressure, subcooling temperature, total heating power and heating power distribution. Also, experimental results from this study were compared with the results from a numerical study of the characteristic pressure curve of two-phase flow [1].The experimental study showed that all the analyzed parameters influence the behavior of the pressure characteristics curve. The comparison with the numerical study showed the same trends for behavior for the pressure characteristic curve for all analyzed parameters except for the total heating power.From the analyzed parameters it was shown that the inlet pressure has the largest relative influence on the behavior of the pressure characteristic curve compared to the other parameters. Lowering the inlet pressure leads to the largest change in the mass flux range where flow instabilities can occur. Lowering the inlet pressure also leads to the largest change in the negative slope the pressure characteristic curve.

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4

Ahn, Hee Seok. "Heat transfer enhancement in single-phase forced convection with blockages and in two-phase pool boiling with nano-structured surfaces". Texas A&M University, 2003. http://hdl.handle.net/1969.1/5869.

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The first study researched turbulent forced convective heat (mass) transfer down- stream of blockages with round and elongated holes in a rectangular channel. The blockages and the channel had the same cross section, and a distance equal to twice the channel height separated consecutive blockages. Naphthalene sublimation experiments were conducted with four hole aspect ratios (hole-width-to-height ratios) and two hole-to-blockage area ratios (ratios of total hole cross-sectional area to blockage area). The effects of the hole aspect ratio, for each hole-to-blockage area ratio, on the local heat (mass) transfer distribution on the exposed primary channel wall between consecutive blockages were examined. Results showed that the blockages with holes enhanced the average heat (mass) transfer by up to 8.5 and 7.0 times that for fully developed turbulent flow through a smooth channel at the same mass flow rate, respectively, in the smaller and larger hole-to-blockage area ratio (or smaller and larger hole diameter) cases. The elongated holes caused a higher average heat (mass) transfer and a larger spanwise variation of the local heat (mass) transfer on the channel wall than did the round holes. The second study explored the heat transfer enhancement for pool boiling on nano-structured surfaces. Experiments were conducted with three horizontal silicon surfaces, two of which were coated with vertically aligned multi-walled carbon nanotubes (MWCNT) with heights of 9 and 25 ÃÂ¹m, respectively, and diameters between 8 and 15 nm. The MWCNT arrays were synthesized on the two silicon wafers using chemical vapor deposition. Experimental results were obtained over the nucleate boiling and film boiling regimes under saturated and sub-cooled (5ÃÂ±C and 10ÃÂ±C) boiling conditions. PF-5060 was the test fluid. Results showed that the MWCNT array with a height of 25 ÃÂ¹m enhanced the nucleate and film boiling heat fluxes on the silicon surface by up to 380% and 60%, respectively, under saturated boiling conditions, and by up to 300% and 80%, respectively, under 10ÃÂ±C sub-cooled boiling conditions, over corresponding heat fluxes on a smooth silicon surface. The MWCNT array with a height of 9 ÃÂ¹m enhanced the nucleate boiling heat flux as much as the taller array, but did not significantly enhance the wall heat flux in the film boiling regime.

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5

Govinder, Kuvendran. "Theoretical analyses and design, construction and testing of a flow loop for the study of generalised forced and natural convection boiling heat transfer phenomena on typical light-water nuclear reactor fuel pin configurations". Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/71554.

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Abstract (sommario):

In a worldwide pursuit for more Accident Tolerant nuclear Fuel (ATF), the quest to obtain and certify alternative nuclear fuel cladding tubes for light-water nuclear power reactors is still a key challenge. One of the facets in this program to develop more ATF is the heat transfer evaluation between the various proposed clad tubes manufactured from suitable replacement materials and the current problematic zirconium-alloy based clad tubes used in nuclear power reactors. For the heat transfer analysis, the accurate measurement of the temperature on the heat transfer surface of heated tubes to be tested was one of the important objectives for the effective analysis of the heat transfer characteristics to the water coolant. After extensive investigations, a suitable technique was developed and validated against recognised forced-convection heat transfer correlations. The results showed that this technique was well suited for external forced convection heat transfer studies from heated surfaces exposed to forced convection water coolants.
Dissertation (MSc)--University of Pretoria, 2019.
Mechanical and Aeronautical Engineering
MSc (Applied Science - Mechanics)
Unrestricted

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6

Muhr, Laurence. "Étude du procédé de fabrication des graisses au lithium complexe". Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL151N.

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Abstract (sommario):

Les procédés de fabrication de graisses de lubrification se sont souvent développés de façon empirique dans l'industrie pétrochimique. Face aux difficultés rencontrées lors du développement de nouveaux produits, une recherche plus fondamentale a été entreprise avec pour objectif d'améliorer la conduite du procédé de fabrication des graisses, dans le cas présent des graisses au lithium complexe. Dans un premier temps, une étude critique et explicative du procédé a été réalisée afin d'identifier les séquences susceptibles d'influer fortement sur la qualité du produit final. Il s'est avéré qu'une connaissance plus fondamentale des phénomènes lies à l'ébullition de fluides non newtoniens en cuve agitée était requise. L'étude envisagée dépassait donc le cadre strict de la fabrication des graisses. En effet, les problèmes d'ébullition en milieu fluide visqueux non newtoniens sont fréquents dans l'industrie et ont fait l'objet de très peu d'études jusqu'à maintenant. Dans un second temps, le transfert thermique au cours de ces opérations a été étudié de façon expérimentale sur des fluides modèles puis sur des graisses. Des résultats nouveaux quant à l'influence des propriétés rhéologiques de la charge sur les différents régimes d'ébullition en présence de convection forcée ont été obtenus

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7

Sun, Guang. "Heat transfer in forced convective flow boiling". Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/11255.

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8

Kandlbinder, Thomas. "Experimental investigation of forced convective boiling of hydrocarbons and hydrocarbon mixtures". Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/7918.

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9

Ahmad, Masroor. "Critical heat flux and associated phenomena in forced convective boiling in nuclear systems". Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9181.

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In evaporation of a liquid flowing in a tube or nuclear fuel element, there exists a transition (known as "dryout", "burnout", "boiling crisis" or "critical heat flux", CHF) from a high heat transfer coefficient regime to one of greatly reduced heat transfer coefficient. The conditions leading to dryout or CHF and the behaviour of wall temperatures in the ("post dryout or post CHF") region beyond it are of immense importance in nuclear reactor safety. In a nuclear reactor, the clad temperature excursion in the post-dryout region may be unacceptably high and the prediction of the location of dryout and the magnitude of the temperature excursion into the post-dryout region is of great importance. Moreover, the dryout transition and its effects are important not only in nuclear plant but also in many other types of heat transfer equipment. The main focus of work described in this thesis was the improvement and validation of phenomenological models for the prediction of CHF and of heat transfer beyond CHF ("post CHF" or "post dryout" heat transfer). The main focus has been on the process of annular film dryout. In phenomenological modelling of this process the dryout location prediction is sensitive to the boundary value of entrained fraction at churn annular transition, especially at high flow rates. The model was extended to churn flow so that integration of entrainment, deposition and evaporation processes could be started from onset of churn flow. A new correlation for the prediction of entrainment rate in churn flow was presented. The application of the new methodology to experimental data leads to improved predictions of CHF. Another long-standing problem, i.e. effect of heat flux on droplet entrainment, is addressed by analysing the contradictory results of previous experiments by using the annular film dryout model. The capability of phenomenological models to cover the whole range of CHF scenarios, i.e. from subcooled or very low quality to very high quality CHF, was demonstrated by using a possible transition criterion from bubble crowding model (an improved version of the Weisman Pie model) to annular film dryout model. These improved phenomenological models captured trends of CHF data very well (including the Look Up Table data of Groeneveld et al. 2007) and produced improved results over a wide range of system parameters such as pressure, mass flux and critical quality. The implementation of the phenomenological models was pursued by modifying and developing an Imperial College computer code GRAMP. In addition to its application in modelling CHF, the GRAMP code was extended to the post dryout region and predictions for this region compared to a range of data and the results were found to be satisfactory.

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10

Kiameh, Bassam Philip. "Prediction of critical heat flux (CHF) for non-aqueous fluids in forced convective boiling". Thesis, University of Ottawa (Canada), 1986. http://hdl.handle.net/10393/21731.

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Libri sul tema "Forced convection boiling"

1

A study of forced convection boiling under reduced gravity: Final report. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1991.

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2

L, Linne Diane, Rousar Donald C e United States. National Aeronautics and Space Administration., a cura di. Forced convection boiling and critical heat flux of ethanol in electrically heated tube tests. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Capitoli di libri sul tema "Forced convection boiling"

1

Kolev, Nikolay Ivanov. "Forced convection boiling". In Multiphase Flow Dynamics 3, 213–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21372-4_10.

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2

Herwig, Heinz. "Strömungssieden (forced convection boiling)". In Wärmeübertragung A-Z, 226–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-56940-1_51.

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3

Zohar, Yitshak. "Steady, Forced Convection Boiling in Micro Ducts". In Heat Convection in Micro Ducts, 99–130. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3607-6_7.

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4

Yu, Wenhua, David M. France e Jules L. Routbort. "Forced Convective Boiling of Ethylene Glycol/Water Mixtures Inside a Small Tube". In Film and Nucleate Boiling Processes, 376–401. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2011. http://dx.doi.org/10.1520/stp49346t.

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Yu, Wenhua, David M. France e Jules L. Routbort. "Forced Convective Boiling of Ethylene Glycol/Water Mixtures Inside a Small Tube". In Film and Nucleate Boiling Processes, 376–401. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2011. http://dx.doi.org/10.1520/stp153420120017.

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6

Mohammed Shah, Mirza. "Forced Convection Subcooled Boiling". In Two-Phase Heat Transfer, 123–49. ASME-Wiley, 2021. http://dx.doi.org/10.1115/1.862tht_ch4.

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7

Wang, Tien-Chen, Trevor J. Snyder e Jacob N. Chung. "Forced-Convection Subcooled Nucleate Boiling and its Application in Microgravity". In Convective Flow Boiling, 111–16. CRC Press, 2019. http://dx.doi.org/10.1201/9780367812089-12.

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8

Yokoya, Sadao, Makoto Watanabe e Masahiro Shoji. "Upstream Chf of Forced Convection Boiling in an Uniformly Heated Vertical Tube". In Convective Flow Boiling, 201–6. CRC Press, 2019. http://dx.doi.org/10.1201/9780367812089-26.

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9

Shirakawa, Noriyuki, Hideki Horie e Yuichi Yamamoto. "Analysis of the forced convection boiling with the particle interaction method". In Computational Fluid and Solid Mechanics, 1373–75. Elsevier, 2001. http://dx.doi.org/10.1016/b978-008043944-0/50920-3.

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10

Thome, John R., e Andrea Cioncolini. "Forced Convective Boiling". In Encyclopedia of Two-Phase Heat Transfer and Flow I, 177–218. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623216_0024.

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Atti di convegni sul tema "Forced convection boiling"

1

Kurul, N., e Michael Z. Podowski. "MULTIDIMENSIONAL EFFECTS IN FORCED CONVECTION SUBCOOLED BOILING". In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.40.

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2

Peng, Xiao-Feng, e Bu-Xuan Wang. "FORCED-CONVECTION AND BOILING CHARACTERISTICS IN MICROCHANNELS". In International Heat Transfer Conference 11. Connecticut: Begellhouse, 1998. http://dx.doi.org/10.1615/ihtc11.2820.

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3

Baummer, Thomas B., Ebrahim Al-Hajri, Michael M. Ohadi e Serguei V. Dessiatoun. "Forced Convection Boiling in Microchannels for Improved Heat Transfer". In ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2006. http://dx.doi.org/10.1115/icnmm2006-96215.

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This paper presents experimental results from research investigating the heat transfer capabilities of microchannel surfaces using a novel force-fed boiling and evaporation technique. The evaporative surfaces being investigated consist of a series of parallel, high-aspect ratio, open topped microchannels. The different sample surfaces vary in channel density, channel aspect ratio, and channel width and have heat transfer surface areas up to ten times their nominal surface areas. Liquid enters the channels of the evaporative surface from above through a developed system of feed channels. This method organizes a liquid-vapor circulation at the boiling surface that results in dissipation of very high heat fluxes in the boiling/thin film evaporation mode. By using the force-fed boiling technique, nominal area heat transfer rates of 100,000 W/m2-K have been achieved with HFE-7100 as the working fluid [1]. In force-fed boiling, the many very short microchannels are working in parallel; therefore the feed pressure and pumping power are very low. This technique may prove valuable to a wide range of heat transfer applications, particularly for heat removal at high heat flux surfaces.

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4

Lebaigue, Dr Olivier, C. Colin e A. Larue de Tournemine. "FORCED CONVECTION BOILING AND CONDENSATION OF AMMONIA IN MICROGRAVITY". In Annals of the Assembly for International Heat Transfer Conference 13. Begell House Inc., 2006. http://dx.doi.org/10.1615/ihtc13.p12.250.

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5

Situ, Rong, Ye Mi, Xiaodong Sun, Mamoru Ishii e Michitrugu Mori. "Bubble Lift-Off Size in Forced Convection Subcooled Boiling". In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47206.

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Forced convection subcooled boiling experiments were conducted in a BWR-scaled vertical upward annular channel. Water was used as the testing fluid, and the tests were performed at atmospheric pressure. A high-speed digital video camera was applied to capture the dynamics of the bubble nucleation process. Bubble lift-off diameters were obtained from the images for a total of 91 test conditions. A force balance analysis of a growing bubble was carried out. A constitutive relation for bubble lift-off size was obtained by correlating current water data and R113 data from literature. The proposed constitutive relation and experimental data agree well with each other.

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LELAND, J., e L. CHOW. "Forced convection boiling from a non-flush simulated electric chip". In 30th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-251.

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Cruces, Roberto, Bernardo Hernández e Francisco Novas. "Characterization of Boiling Phenomena during Laboratory-Scale Forced Convection Quenching". In The 4th World Congress on Mechanical, Chemical, and Material Engineering. Avestia Publishing, 2018. http://dx.doi.org/10.11159/htff18.159.

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Horiuchi, Keisuke, e Shigeo Ohashi. "Forced-Convection Boiling Characteristics Based on Mass and Energy Conservation". In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33471.

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This paper presents an experimental study and theoretical interpretation of two-phase flow in a closed loop. The objective of this work is to find the optimum flow rate with respect to the thermal design power (amount of heat to be rejected). We assume that forced-convection boiling characteristics are explained based on mass and energy conservation, and claim that our proposed coefficient (C ≡ QL / Q : a ratio of amount of evaporated liquid to the flow rate) indicates the optimum flow rate for wide variation of evaporator-shapes and working fluids. In order to verify our model, we have measured the thermal resistance of evaporator with respect to heater input power for various flow rates. Hydrofluoro ether (HFE) and Fluorinert™ refrigerants were used as the working fluid in the experiment. Here flow rate of 40∼120ml/min and thermal design power of 50∼200W were controlled by the pump and by the heater, respectively. We observed that the coefficient resulted in the optimum flow rate is almost the same regardless of working fluids and evaporator shapes. The data which indicates the optimum flow rate were quite well reproduced by our proposed theory when the value of this coefficient is C ≈ 0.7∼0.95. For the demonstration, we designed the assembled-type two-phase cooling module with the optimum flow rate based on our model, and we observed that the evaporator had a relatively small thermal resistance of 0.1K/W.

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9

Aziz, S., Geoffrey F. Hewitt e D. B. R. Kenning. "HEAT TRANSFER REGIMES IN FORCED-CONVECTION FILM BOILING ON SPHERES". In International Heat Transfer Conference 8. Connecticut: Begellhouse, 1986. http://dx.doi.org/10.1615/ihtc8.700.

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Maulbetsch, John S., e Peter Griffith. "SYSTEM-INDUCED INSTABILITIES IN FORCED CONVECTION FLOWS WITH SUBCOOLED BOILING". In International Heat Transfer Conference 3. Connecticut: Begellhouse, 2019. http://dx.doi.org/10.1615/ihtc3.540.

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Rapporti di organizzazioni sul tema "Forced convection boiling"

1

Gehrke, V., e S. G. Bankoff. Stability of forced-convection subcooled boiling in steady-state and transient annular flow. Office of Scientific and Technical Information (OSTI), giugno 1993. http://dx.doi.org/10.2172/10194741.

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Dorra, H., S. C. Lee e S. G. Bankoff. A critical review of predictive models for the onset of significant void in forced-convection subcooled boiling. Office of Scientific and Technical Information (OSTI), giugno 1993. http://dx.doi.org/10.2172/10194563.

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3

Wong, Christopher F. A computer code for calculating subcooled boiling pressure drop in forced convective tube flows. Office of Scientific and Technical Information (OSTI), dicembre 1988. http://dx.doi.org/10.2172/5910189.

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