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International Heat Transfer Conference 13

ISBN Imprimir: 1-56700-226-9 (CD)
ISBN En Línea: 1-56700-225-0

AN EXPERIMENTAL STUDY ON PRESSURE DROP AND HEAT TRANSFER PERFORMANCE OF SUB-COOLED AND SATURATED FLOW BOILING IN A MICRO-TUBE

DOI: 10.1615/IHTC13.p28.290
page 9

Y. X. Hong
Institute of Engineering Thermophysics, Chinese Academy of Sciences; and Graduate University of the Chinese Academy of Sciences, Beijing, China

T. D. Wei
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China

W. J. Hui
Institute of Engineering Thermophysics, Chinese Academy of Sciences; and Graduate University of the Chinese Academy of Sciences, Beijing, China

Sinopsis

This paper presents an experimental study on the pressure drop and the heat transfer performance of sub-cooled and saturated water boiling in a horizontal stainless steel micro-tube with an inside diameter of 0.399 mm and heated length of 80mm. The experiments have been conducted under the conditions of mass flux from 79.6 to 265.4 kg/m2s, inlet temperature from 30 to 60 °C, and heat flux from 5 to 25 W/cm2. It is observed that the outlet temperature and pressure drop fluctuated dramatically during sub-cooled flow boiling. Using the Infrared Radiometry, the flow boiling patterns are estimated from the thermographs. It is found that the flow boiling patterns of water in micro-tube are consisted of alternate changes of sub-cooled single flow, plug flow and annular flow with increasing of the heat flux, the fluid met the saturated boiling. Based on the experimental result, a new pressure drop correlation is derived with the mean absolute error less than 10.4%. The effects of mass flux, inlet temperature and vapor quality on the saturated boiling heat transfer performance are discussed.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION