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: In this article, the authors extensively assess and validate the wall heat flux partitioning (WHFP) model in the coupled Eulerian-Eulerian Multiphase Flow (EEMF) method to simulate subcooled flow boiling conditions at high pressures.
55 citations
TL;DR: In this paper, the behavior of two-phase flow instability of a twin-channel system is studied experimentally, and the instability boundaries of the twin channel system are obtained in the phase plane of the subcooling and phase change number.
55 citations
TL;DR: In this article, the feasibility of a vapor compression/absorption hybrid refrigeration cycle for energy saving and utilization of waste heat is discussed, and a prototype of the cycle is constructed, in which a compressor and an absorption unit are combined in series.
Abstract: This paper discusses the feasibility of a vapor compression/absorption hybrid refrigeration cycle for energy saving and utilization of waste heat. The cycle employs propane as a natural refrigerant and a refrigeration oil as an absorbent. A prototype of the cycle is constructed, in which a compressor and an absorption unit are combined in series. The performance of the cycle is examined both theoretically and experimentally. Although the solubility of the propane with the oil is not enough as a working pair in the absorption unit, the theoretical calculation shows that the hybrid cycle has a potential to achieve a higher performance in comparison with a simple vapor compression cycle by using the waste heat. In the experiment, the prototype cycle is operated successfully and it is found that an improvement of an absorber is necessary to achieve the good performance close to the theoretical one. The application of an AHE (absorber heat exchanger) can reduce the heat input to a generator. Further examinations on some other combinations of refrigerant/refrigeration oil and additives are desirable.
54 citations
TL;DR: In this article, a large number of experiments dealing with flashing flows in converging and converging-diverging nozzles reveals that knowledge of the flashing inception point is the key to the prediction of critical flow rates.
Abstract: Examination of a large number of experiments dealing with flashing flows in converging and converging-diverging nozzles reveals that knowledge of the flashing inception point is the key to the prediction of critical flow rates. An extension of the static flashing inception correlation of Jones (16) and Alamgir and Lienhard (17) to flowing systems has allowed the determination of the location of flashing inception in nozzle flows with subcooled inlet conditions. It is shown that in all the experiments examined with subcooled inlet regardless of the degree of inlet subcooling, flashing inception invariably occurred very close to the throat. A correlation is given to predict flashing inception in both pipes and nozzles which matches all data available, but is lacking verification in intermediate nozzle geometries where turbulence may be important. A consequence of this behavior is that the critical mass flux may be correlated to the pressure difference between the nozzle inlet and flashing inception, through a single phase liquid discharge coefficient and an accurate prediction of the flashing inception pressure at the throat. Comparison with the available experiments indicate that the predicted mass fluxes are within 5 percent of the measurements.
54 citations
TL;DR: In this paper, the authors found that the time to achieve wetting of hot rods in air by a hot water jet was found to be a very strong function of water subcooling and surface thermal conductivity.
54 citations