Integrated optimization of flow patterns and heat transfer in horizontal rotating channel based on response surface method

Abstract

Horizontal rotating channel is used in multi-channel cylinder dryer and other heat transfer equipment, which can greatly improve the heat transfer performance, and has very important research value. In order to investigate the relationship between flow patterns, heat transfer coefficients and other parameters in the horizontal rotating channel, response surface analysis was innovatively used in this experiment, and the response surface equation was also constructed. The Nusselt number response surfaces for different flow patterns were obtained by polynomial fitting. The results show that the rotation has a greater effect on the heat transfer and flow pattern of the horizontal channel, and a higher rotating speed will reduce or homogenize the fluctuation of the distribution of heat transfer coefficients along the flow direction while hindering the flow heat transfer, so that the overall heat transfer performance will be more uniform. Response surface analysis obtained a theoretical maximum value of lnNu of 11.79 for all flow patterns in the case of atomized flow. At the same time, in order to achieve the best overall heat transfer performance, the mass flow rate of steam and the setting temperature should be at least as high as possible, while trying to maintain a low rotating speed.