期刊
NUCLEAR ENGINEERING AND DESIGN
卷 313, 期 -, 页码 162-176出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.nucengdes.2016.12.016
关键词
Convective heat transfer; Supercritical pressure; Experimental data; Carbon dioxide; Heat transfer deterioration; Obstacles
资金
- Natural Resources Canada through the Office of Energy Research and Development
- Atomic Energy of Canada Limited
- Natural Sciences and Engineering Research Council of Canada
Heat transfer measurements to CO2-cooled tubes with and without flow obstacles at supercritical pressures were obtained at the University of Ottawa's supercritical pressure test facility. The effects of obstacle geometry (obstacle pitch, obstacle shape, flow blockage) on the wall temperature and heat transfer coefficient were investigated. Tests were performed for vertical upward flow in a directly heated 8 mm ID tube for a pressure range from 7.69 to 8.36 MPa, a mass flux range from 200 to 1184 kg/m(2) s, and a heat flux range from 1 to 175 kW/m(2). The results are presented graphically in plots of wall temperature and heat transfer coefficient vs. bulk specific enthalpy of the fluid. The effects of flow parameters and flow obstacle geometry on supercritical heat transfer for both normal and deteriorated heat transfer are discussed. A comparison of the measurements with leading prediction methods for supercritical heat transfer in bare tubes and for spacer effects is also presented. The optimum increase in heat transfer coefficient was found to be for blunt obstacles, having a large flow blockage, and a short obstacle pitch. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据