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RISS 인기검색어
- 검색키워드
- 저자 : Luis Andree Pusey Alvarado (검색결과 1 건)
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Experimental study about effects of downward inclination on condensation of pure steam in a tube
Luis Andree Pusey Alvarado 경희대학교 대학원 2017 국내석사
Effects of downward inclination angle on two-phase flow structure and heat transfer coefficient were experimentally studied during condensation of pure steam in a tube. Cross-sectional two-phase flow structure was visualized by applying the concept of axial-viewing technique and corresponding heat transfer coefficient was measured. Condensation experiments of saturated steam under atmospheric pressure were conducted in a tube with inner diameter of 17 mm at a steam mass flux of 3.43 kg/m2s and three steam qualities were tested with values of 0.26, 0.54 and 0.93. The heat transfer results showed that the heat transfer coefficient was increased up to 11% independently of the steam quality condition. The obtained cross-sectional two-phase flow structure images indicated that as inclination angle increases, stratified flow is the only flow pattern without transition to annular flow, but geometry of the liquid-vapor interface varied from concave to convex. The information of the image structure obtained from the visualization results allowed to calculate the average condensation heat transfer coefficient by a combination of film condensation and single-phase forced convection. Based on a comparison between the calculated condensation heat transfer coefficient and the measurement data, a plausible approach to incorporate the effects of inclination angle into an existing correlation was discussed.
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