| Title |
An Experimenatl Study on the Convective Boiling in Inclined Tubes |
| Keywords |
Convective boiling heat transfer ; 대류비등 열전달 ; R-113, Inclined tube ; 경사관 ; Circumferential anisothermality ; 원주방향 비등온성 ; Critical quality ; 임계건도 |
| Abstract |
An experiment is conducted to investigate the effect of the inclination angle on convective boiling heat transfer of a uniformly heated tube. The test section used is a stainless steel tube with 10.7 mm in inner diameter. The heating length is 3 m and is heated directly by an AC current. The test fluid is R-113. Experiments are carried out with mass flow rates of 300, 500 and 700 kg/m2s, and heat fluxes varying from 5 to 65 kW/m2. The inclination angles of the tube are 0 , 5 , 11and 25 . The circumferential temperature variation at low quality region and the location of dryout at high quality region are mainly observed. Circumferential anisothermality occurring at low mass flow rate and low quality conditions is gradually reduced with the increase in the inclination angle and finally disappears at the inclination angle of 25 . Critical quality where dryout is initiated is seriously influenced by the inclination angle. Wall temperature after critical quality is also affected by the inclination angle. |