Dissertation•
Film boiling on the inside of vertical tubes with upward flow of the fluid at low qualities
01 Jan 1963-
TL;DR: Thesis (Sc. D. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1963 as discussed by the authors, Boston, Massachusetts, U.S.A.
Abstract: Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1963.
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01 Oct 2007
TL;DR: In this paper, a comprehensive introduction to the fundamentals and applications of flow and heat transfer in conventional and miniature systems is provided, providing a comprehensive review of single-phase flow fundamentals and interfacial phenomena, detailed and clear discussion is provided on a range of topics, including two-phase hydrodynamics and flow regimes, mathematical modeling of gas-liquid 2-phase flows, pool and flow boiling, flow and boiling in mini and microchannels, external and internal-flow condensation with and without noncondensables, condensation in small flow passages, and two-
Abstract: Providing a comprehensive introduction to the fundamentals and applications of flow and heat transfer in conventional and miniature systems, this fully enhanced and updated edition covers all the topics essential for graduate courses on two-phase flow, boiling, and condensation. Beginning with a concise review of single-phase flow fundamentals and interfacial phenomena, detailed and clear discussion is provided on a range of topics, including two-phase hydrodynamics and flow regimes, mathematical modeling of gas-liquid two-phase flows, pool and flow boiling, flow and boiling in mini and microchannels, external and internal-flow condensation with and without noncondensables, condensation in small flow passages, and two-phase choked flow. Numerous solved examples and end-of-chapter problems that include many common design problems likely to be encountered by students, make this an essential text for graduate students. With up-to-date detail on the most recent research trends and practical applications, it is also an ideal reference for professionals and researchers in mechanical, nuclear, and chemical engineering.
270 citations
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TL;DR: In this article, a numerical model is developed to simulate the transient performance characteristics of loop heat pipes (LHP), which satisfactorily simulates the overall dynamic behavior of an LHP unit tested under ambient and vacuum environments.
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TL;DR: In this article, a detailed model of heat transfer and fluid flow has been reported for numerical simulation of latent heat storage unit which takes into account the solid/liquid and water/vapour phase change processes occurring simultaneously in the PCM and heat transfer fluid with appropriate coupling between them.
Abstract: The present article reports on the research work carried out within the framework of the European project DISTOR. The objective is to conceive, analyze and test systems of storage of thermal energy of the type PCM (phase change materials) adapted to DSG (direct steam generation) technology for electricity production. A detailed model of heat transfer and fluid flow has been reported for numerical simulation of latent heat storage unit which takes into account the solid/liquid and water/vapour phase change processes occurring simultaneously in the PCM and heat transfer fluid with appropriate coupling between them. Reasonable and justified assumptions are then proposed in order to define the most significant process controlling parameters and derive a useful simplified model. Design and optimization procedure have been advised based on the present detailed and simplified models. The influences of various parameters on the operation of the system as well as the potential of new PCM composites are studied.
66 citations
References
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TL;DR: In this paper, an analytical expression for the heat-transfer coefficient near the minimum in film pool boiling from a horizontal surface was derived, based on a simplified geometrical model.
Abstract: Taylor-Helmholtz Hydrodynamic Instability and its significance with regard to film boiling heat transfer from a horizontal surface is discussed. It is shown that near the minimum film-boiling heat flux, the bubble spacing and growth rate is determined by Taylor Instability neglecting the effect of fluid depth and viscosity. Utilizing a simplified geometrical model, an analytical expression for the heat-transfer coefficient near the minimum in film pool boiling from a honizontal surface was derived. Combining this equation with the available correlation for the minimum heat flux yields an analytical equation for the temperature difference at the minimum, which defines the location of the minimum point. The above equations agree with the available experimental measurements made on n-pentane and carbon tetracliloride within plus or minus 10 per cent. (auth)
582 citations
127 citations
74 citations
Journal Article•
TL;DR: In this paper, a new equation for film boiling at a vertical surface for saturated liquids in the absence of forced flow was presented, where the principal approximations are that vapor flow near the low end of the heating surface is viscous and Bromely's equation is valid there, turbulence develops where the local Reynolds number reaches about 100, and in the turbulent region the thermal resistance is due entirely to the laminar sublayer.
Abstract: A new equation is presented for film boiling at a vertical surface for saturated liquids in the absence of forced flow. The principal approximations are that vapor flow near the low end of the heating surface is viscous and Bromely's equation is valid there, turbulence develops where the local Reynolds number reaches about 100, and in the turbulent region of the heating surface thermal resistance is due entirely to the laminar sublayer. Tests with five liquids on tubes having lengths between 2 and 6.3 in., and a range of DELTA T from 200 deg to 780 deg F., show that the equation is reliable to within an average error of about plus or minus 32%. (auth)
58 citations
TL;DR: In this article, heat transfer results for film boiling in the presence of a subcooled liquid were determined analytically for the case of the isothermal vertical plate, and the two-phase flow and heat transfer problem which arises was formulated exactly within the framework of boundary-layer theory, and free convection within the liquid was accounted for.
Abstract: Heat-transfer results for film boiling in the presence of a subcooled liquid were determined analytically for the case of the isothermal vertical plate. The two-phase flow and heat-transfer problem which arises was formulated exactly within the framework of boundary-layer theory, and free convection within the liquid was accounted for. At a fixed temperature difference between surface and saturation, the effect of subcooling is to increase the heat transfer from the plate surface, with the magnitude of the increase being controlled by five physical parameters. Graphical presentation of the heat-transfer resuits is made for parametric values which correspond to water, but this information may be applied to other fluids having similar parameter ranges. For large subcooling, the heat transfer is essentially equal to that for pure free convection (no boiling), and the limits for this condition are given. (auth)
54 citations