仿蜂窝状模块化毛细管换热器换热与流动特性实验研究

As the power Output of the mini-channel shell and tube heat exchanger is limited and the mass production is challcnging because of difficulty in tube inserting and low tube bending strength, a honeycomb-inspired assembled heat exchanger design was proposed. By standardizing the corc modulc, this design features low cost, high compactncss, and supcrior heat transfcr cocfficicnts. The heat exchanger prototype used 316L stainless steel mini-channel tubes with an outer diameter of 3 mm and an inner diameter of 2 mm. The surfacc compaetness of the exchanger was 1 073 m2/m3 > and the shell-side compaetness was 234. 6 m" /m3, higher than thosc of conventional mini-channel shell and tube heat exchangers. A watcr-to-water heat exchange test bench was sei up with a shell-side Reynolds number ränge of 200—1 400 to test the heat transfcr and flow resistance characteristics.As rcvcaled by the experiment, the shell-side heat transfcr cocfficicnt of the mini-channel shcll and tube heat exchanger with honeycomb modular structure is five times that of conventional shell and tube heat exchangcrs. The blocking tubcs between the modules play a crucial rolc in enhancing shell-side heat transfer Performance by preventing fluid bypassing between the modules. Through Simulation and optimization of the internal structure, the shell-side flow resistance was effectively reduced, and the friction factor of the shell-side tube bündle of the mini-channel shell and tube heat exchanger is lower than that of conventional mini-channel shell and tube heat exchangcrs.