NUCLEATE POOL BOILING FROM PLAIN AND ENHANCED SINGLE TUBE TO R12 AND R134a FOR AIR-CONDITIONING EVAPORATORS
نویسندگان
چکیده
منابع مشابه
Heat transfer in nucleate pool boiling of multicomponent mixtures
Steady state pool boiling heat transfer coefficients have been obtained experimentally for acetone–isopropanol–water and acetone–MEK (methyl ethyl ketone)–water ternary systems. The data show that, for a given heat flux, the heat transfer coefficients of mixtures are lower than those obtained for pure components constituting the mixture. The measured heat transfer coefficients were compared wit...
متن کاملMomentum effects in steady nucleate pool boiling during microgravity.
Pool boiling experiments were conducted in microgravity on five space shuttle flights, using a flat plate heater consisting of a semitransparent thin gold film deposited on a quartz substrate that also acted as a resistance thermometer. The test fluid was R-113, and the vapor bubble behavior at the heater surface was photographed from beneath as well as from the side. Each flight consisted of a...
متن کاملDirect Numerical Simulation of Subcooled Nucleate Pool Boiling
With the long-term objective of Critical Heat Flux (CHF) prediction, a Direct Numerical Simulation (DNS) framework for simulation of subcooled and saturated nucleate pool boiling is developed. One case of saturated, and three cases of subcooled boiling at different subcooling levels are simulated. Grid refinement study is also reported. Both boiling and condensation phenomena can be computed si...
متن کاملPool Boiling Heat Transfer and Bubble Dynamics Over Plain and Enhanced Microchannels
Pool boiling is of interest in high heat flux applications because of its potential for removing large amount of heat resulting from the latent heat of evaporation and little pressure drop penalty for circulating coolant through the system. However, the heat transfer performance of pool boiling systems is not adequate to match the cooling ability provided by enhanced microchannels operating und...
متن کاملEffect of Dynamic Contact Angle on Single Bubbles during Nucleate Pool Boiling
Nucleate pool boiling at low heat flux is typically characterized by cyclic growth and departure of single vapor bubbles from the heated wall. It has been experimentally observed that the contact angle at the bubble base varies during the ebullition cycle. In the present numerical study, dynamic advancing and receding contact angles obtained from experimental observations are specified at the b...
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ژورنال
عنوان ژورنال: International Conference on Aerospace Sciences and Aviation Technology
سال: 1999
ISSN: 2636-364X
DOI: 10.21608/asat.1999.24910