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EXPERIMENTAL STUDY ON CONDENSATION HEAT TRANSFER OF STEAM IN HORIZONTAL TUBE

Yaoxuan Wang
Dalian University of Technology, 2 Ling Gong Rd. Dalian 116024, China

Shengqiang Shen
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Key Laboratory for Desalination of Liaoning Province, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

Xingsen Mu
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Key Laboratory for Desalination of Liaoning Province, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

Weihao Chen
Dalian University of Technology, 2 Ling Gong Rd. Dalian 116024, China

DOI: 10.1615/TFEC2018.fmp.024472
pages 1033-1042


KEY WORDS: condensation, horizontal tube, heat transfer coefficient

Abstract

The heat transfer characteristics of steam condensation flow in a vacuum horizontal long tube were studied experimentally when the saturation temperature varies from 50 to 70 °C, mass flow rate is no more than 11 kg/(m2·s) and temperature differences between steam and cooling water are 3, 5 and 7 °C respectively. The tube wall is divided into filmwise condensation section and liquid accumulation section by the stratified interface. The local heat transfer coefficient in filmwise condensation section is significantly higher than that in liquid accumulation section. The local heat transfer coefficient increases with vapor quality and steam mass flow rate for all locations along the circumferential direction. The increase of temperature difference between steam and cooling water causes the decrease of local heat transfer coefficient in filmwise condensation section and has less effect on that in liquid accumulation section. With the change of steam saturation temperature, the local heat transfer coefficients in two sections of the tube appear different variation tendencies.

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