直插式垫条型缠绕管式换热器过程强化

In order to enhance the comprehensive heat transfer performance of the spiral-winding tube heat exchanger, this paper presents a kind of vertically inserting space bars which is installed on the inner wall of the core tube of the spiral-winding tube heat exchanger along the radial direction. By means of numerical simulation, the flow and heat transfer performance of the spiral-winding tube heat exchanger with vertically inserting space bars were studied. Compared with traditional structure, it can also be used as a vortex generator while fixing the relative position of the tube bundle, affecting the wake field formed by the tube bundle, generating continuous turbulence on the boundary layer of the tube bundle, and enhancing the comprehensive heat transfer performance of the spiral-winding tube heat exchanger. Under the same imported conditions, the Nusselt number on the shell side of the spiral-winding tube heat exchanger with vertically inserting space bars was increased by 13.01% to 15.55% compared with the traditional structure, and the pressure drop is increased by 1.3% to 4.3%. And the comprehensive heat transfer performance can be increased by 7.4% to 10.5%. On this basis, the influence of different arrangements of the vertically inserting space bars on the flow and heat transfer performance was studied. The results showed that the comprehensive heat transfer performance of aligned arrangement was the best under the operating conditions of Reynolds number of 5000 to 24000, and the comprehensive heat transfer performance of staggered arrangement was the best under the operating conditions of Reynolds number of 24000 to 30000.