Investigation of Condensation Heat Transfer Characteristic along the outside Horizontal Integralfin Tubes

摘要

The study reveals that the heat transfer varisation for film condensation on horizontal low integral-fin tubes,measuring the experimental determinatiion based on the high flow rates,departed the condensation heat transfer coefficient,associated with the numerical calculation to get the changeable trend along the tube.the investigation of the condensation heat transfer for pure fluids and the azeotropic refrigerant shows that the heat flux change violently along the tube,at the range of the experiment paramenters.the value of the heat flux at the range of the experiment parameters.The value of the heat flux at the outlet is 81.3～83.7％ compared to inlet.Both beat transfer coefficient and overall heat transfer coefficient of inside and outside tube show a faint change along the tube.The velocity of the water in the tube is an important factor which affects the uniformity of heat flux along the tube;the temperature of the water at the inlet of the tube is slightly affected,comparatively.The conclusion of the investigation can be used to guide the designs of the condenstation heat transfer experiment on horizontal single-tube and the heat exchanger.