Deterioration of heat transfer to supercritical helium at 2.5 atmospheres
Abstract
Heat transfer has been investigated for supercritical helium at 2.5 atm flowing inside a vertical tube with inlet bulk fluid temperatures less than the transposed critical temperature. Results indicate that for high-heat-flux conditions, the heat-transfer coefficient passes through a maximum and then deteriorates as the fluid temperature approaches the transposed critical temperature. This is contrary to the prediction of a correlation developed in an earlier study of supercritical helium heat transfer under low-heat-flux conditions, which only predicts enhancement in heat transfer as the transposed critical temperature is approached. The experimental data are presented and conditions under which heat-transferr deterioration was observed are discussed. The probable limitations to the validity of the above-mentioned heat-transfer-coefficient correlation, developed for a different range of experimental data, are also discussed.
- Publication:
-
International Journal of Heat and Mass Transfer
- Pub Date:
- May 1975
- DOI:
- 10.1016/0017-9310(75)90276-8
- Bibcode:
- 1975IJHMT..18..649G
- Keywords:
-
- Heat Transfer Coefficients;
- Helium;
- Pipe Flow;
- Pressure Effects;
- Supercritical Flow;
- Thermodynamic Efficiency;
- Convective Heat Transfer;
- Critical Pressure;
- Critical Temperature;
- Forced Convection;
- Heat Flux;
- Inlet Flow;
- Thermal Degradation;
- Fluid Mechanics and Heat Transfer