关键词: 复合中空热管, 传热, 充液率, 热流密度

Abstract: The composite hollow heat pipe can effectively solve the problem of acid dew corrosion of heat exchanger equipment comprising ordinary gravity heat pipe，and has an important application in recycling waste heat of low temperature flue gas. A heat transfer experimental platform of composite hollow heat pipe was established，and the heat transfer characteristics of condensation section were investigated experimentally. A stainless steel tube of total length of 1080mm with methanol was studied. Electrical heating was used in the evaporation section and water cooling was used in the condensation section. Wall temperatures and inlet and outlet temperatures of cooling water were measured with K type thermocouples. Vapor saturation pressure in heat pipe was measured by vacuum pressure sensor. The effect of two parameters：filling rate (15%≤V+≤40%) and evaporator heat flux (9.48kW/m2≤q≤37.91kW/m2) on the heat transfer characteristics of condensation section were investigated. When filling rate was 20%，the composite hollow heat pipe had the maximum condensation heat transfer coefficient and showed the best isothermal characteristics of its condensation section and the best heat transfer performance. Besides，with the increase of evaporator heat flux，the effective condensation length of the composite hollow heat pipe and the condensation heat transfer coefficient increased. Experimental investigation provides a basis for industrial applications.

Key words: composite hollow heat pipe, heat transfer, filling rate, heat flux