The influence of interface thermal contact resistance on the heat transfer performance of prestressed Duplex tube
نویسنده
چکیده
Duplex heat exchanger tubes consist oftwo concentric cylinders assembled in a state ofprestress by shrink fitting. During operation, thermal expansion changes the interface pressure and this can cause a substantial increase in the thermal resistance of the tube. Under certain circumstances, more than one steadystate solution can be obtained. In this paper, the effect of this mechanism on the axial temperature variation in parallel or counterflow heat exchangers is analyzed. A method is developed for integrating the controlling equations for an arbitrary, non-linear, pressure-dependent contact resistance without iteration and the effect of prestress and other parameters on the occurrence of multiple solutions is discussed.
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