层流-过渡流型双管螺旋盘管换热器的实验研究

Santosh D. Sancheti, Dipak D. Sancheti
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引用次数: 0

摘要

实验研究了双管螺旋盘管换热器的换热特性、压降、摩擦因数、努塞尔数和迪安数。研究考察了热水质量流量范围为0.02 ~ 0.12 kg/s,冷水质量流量范围为0.055 ~ 0.15 kg/s。冷水进口温度维持在29℃,热水进口温度在65 ~ 75℃之间变化。根据两管之间环空空间的水力直径,雷诺数在1000-6000之间。使用合适的仪器测量了所有需要的参数,如内线圈和环空流体的进出口温度以及流体的流速。进行了72次试验,计算了内盘管侧和环空侧的换热系数。将计算得到的内盘管换热系数与文献中已有的相关系数进行了比较,发现两者吻合较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Study of Double Pipe Helical Coil Heat Exchangers in the Laminar to Transitional Flow Regime
This study experimentally investigates various heat transfer characteristics, pressure drop, friction factor, Nusselt number, and Dean Number in a double-pipe helical coil heat exchanger. The study examines the hot water mass flow rates ranging from 0.02 to 0.12 kg/s and the cold-water mass flow rates ranging from 0.055 to 0.15 kg/s. The cold-water inlet temperature was maintained at 29°C, while the hot water inlet temperature varied between 65-75°C. Based on the hydraulic diameter of the annular space between the two tubes, the Reynolds number ranged from 1000-6000. All required parameters, such as the inlet and outlet temperatures of the inner coil and annulus fluids and the flow rate of fluids, were measured using appropriate instruments. Seventy-two test runs were conducted, from which the heat transfer coefficients of the inner coil side and annulus side were calculated. The calculated heat transfer coefficients of the inner coil were compared with available correlations from the literature, and a reasonable agreement was found.
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