Topic
Subcooling
About: Subcooling is a research topic. Over the lifetime, 6150 publications have been published within this topic receiving 99125 citations.
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TL;DR: Using the improved double distribution function (DDF) thermal Lattice Boltzmann method (LBM), dropwise condensation of dry saturated vapor at a cold spot on vertical hydrophobic flat plates under gravity effects are simulated numerically for the first time as discussed by the authors.
77 citations
TL;DR: In this paper, an experimental investigation of forced convection boiling in a vertical annulus is reported, where the boiling fluid was water both pure and with various amounts of surface active agent added to reduce surface tension.
77 citations
TL;DR: In this paper, population balance equations combined with a three-dimensional two-fluid model are employed to predict bubbly flows with the presence of heat and mass transfer processes, and a comparison of model predictions with local measurements near the test channel exit is made for the radial distribution of the bubble Sauter diameter, void fraction, interfacial area concentration and gas and liquid velocities covering a range of different mass and heat fluxes and inlet subcooling temperatures.
77 citations
TL;DR: A comprehensive review of the literature on the flow of various refrigerants through the capillary tubes of different geometries viz. straight and coiled and flow configurations viz. adiabatic and diabatic, has been discussed in this paper.
77 citations
TL;DR: In this paper, an analytical analysis of R-134a and its replacement, HFO-1234yf, has been performed to show that R134a is particularly well suited as PHP working fluids.
Abstract: The pulsating heat pipe (PHP) is a novel, simply formed, wickless heat pipe that relies on the phase change induced motion of a contained working fluid to transport heat between the evaporator (the hot end) and condenser (the cold end). The improved heat transfer capability, simplicity, and reduced mass of PHPs have lead to great interest in the PHP. This paper reviews one crucial, yet often overlooked, aspect of PHP operation: the working fluid. Analytical analysis is used to show that R-134a and its replacement, HFO-1234yf, are particularly well suited as PHP working fluids. The following five conclusions are reached: 1) surface tension and density play an important role in sizing PHPs for operation in varying gravitational environments; 2) at low vapor pressures, noncondensable gas considerably increases the PHP system pressure, thus subcooling the system; 3) dynamic contact angle and surface tension significantly affect the capillary resistance force acting to damp PHP operation; 4) large viscosities act to damp PHP operation; and 5) latent heat of vaporization, surface tension, and density play a significant part in PHP startup.
77 citations