山东大学能源与动力工程学院,山东 济南 250061
贾文华(1993—),女,硕士研究生,1085941792@qq.com
田茂诚(1965—),男,博士,教授,tianmc65@sdu.edu.cn
收稿:2019-05-09,
修回:2019-05-15,
纸质出版:2019-09-05
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贾文华, 田茂诚, 张冠敏, 魏民. 含不凝气体蒸汽波节管内凝结特性研究[J]. 化工学报, 2019, 70(S2): 201-207
JIA Wenhua, TIAN Maocheng, ZHANG Guanmin, WEI Min. Study on condensation characteristics of vapor with non-condensable gas in corrugated tubes[J]. CIESC Journal, 2019, 70(S2): 201-207
贾文华, 田茂诚, 张冠敏, 魏民. 含不凝气体蒸汽波节管内凝结特性研究[J]. 化工学报, 2019, 70(S2): 201-207 DOI: 10.11949/0438-1157.20190492.
JIA Wenhua, TIAN Maocheng, ZHANG Guanmin, WEI Min. Study on condensation characteristics of vapor with non-condensable gas in corrugated tubes[J]. CIESC Journal, 2019, 70(S2): 201-207 DOI: 10.11949/0438-1157.20190492.
通过数值模拟,研究了波节结构、空气含量及Reynolds数
Re
对含空气的水蒸气波节管内凝结特性的影响,并与圆形换热管内的情况进行了对比。模拟结果表明:空气含量增加,波节管壁面平均传热系数减小;波节管内流体流动和换热过程均呈现振荡波动;波节高度增加,壁面平均传热系数先增加后降低,在波节高度0.032 m达到峰值,而摩擦系数一直增加;波节间距减小,波节宽度增加,壁面平均传热系数及摩擦系数均增大;波节高度对波节管内流动和换热影响均大于波节宽度和波节间距。
This paper presents a numerical investigation on the condensation characteristics of vapor with non-condensable gas in corrugated tubes. Several 2D examples with different corrugated structures
air contents and Reynolds numbers are studied and compared. Results show that along with the increase of air content
the wall average heat transfer coefficient decreases in the corrugated tube. The oscillation of fluid flow and heat transfer is generated due to the corrugated structure. With the increasing of wave height
the skin friction coefficient increased
and the wall average heat transfer coefficient first increased
and then decreased
the maximum of wall average heat transfer coefficient in this paper is in 0.032 m. The influence of wave height on the flow and heat transfer characteristics is more obvious than the width of the wave node and the space between two waves. The effect of inlet fluid flow-rate on the skin friction coefficient is also evaluated and discussed to provide some guidelines for future engineering applications.
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