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对 8根结构参数不同的旋流管的换热特性和管内阻力做了实验研究 ,给出了换热与流阻的关联式。实验中 ,水蒸气与水自成循环 ,旋流管内走冷水 ,水蒸气在管外冷凝 ,冷凝后的凝液用计量杯计量 ,通过改变旋流管内冷水流量 ,得到不同流量下的冷凝传热工况 ;阻力测量在冷态条件下进行 ,常温的水经管道流入旋流管内 ,通过测量不同流量下的压降来测定阻力。实验结果表明 ,所有旋流管的换热系数均高于光滑管 ,与同类型的其它异型强化管相比 ,旋流管传热性能更优越 ,在相同传热量下 ,旋流管的换热系数比螺旋槽纹管高 3%～ 8% ,压力损失低 5%～ 1 0 %。
The experimental research on the heat transfer characteristics and internal resistance of eight spiral tubes with different structural parameters is given. The correlation between heat transfer and flow resistance is given. In the experiment, water vapor and water self-circulate, and the cold water in the spiral pipe is taken. The water vapor is condensed outside the pipe. The condensed condensate is measured by a measuring cup. By changing the flow of cold water in the spiral pipe, Working conditions; resistance measurement in cold conditions, water at room temperature through the pipe into the cyclone, by measuring the pressure drop at different flow rates to determine the resistance. The experimental results show that the heat transfer coefficient of all the spiral tubes is higher than that of the smooth tubes. Compared with the other special-shaped tubes, the spiral tube has better heat transfer performance. Under the same heat transfer, the heat transfer of the spiral tube The coefficient is 3% to 8% higher than the spiral groove and the pressure loss is 5% ~ 10% lower.