高分子减阻剂溶液的热量传递

Heat Transfer of Polymer Drag-Reducing Agent Solution

在湍流流动的流体中加入一定量的某种高分子聚合物不仅使湍流摩擦系数减小,而且使传热、传质系数均减小。本文对水相减阻剂溶液的湍流传热现象进行了研究,通过大最的试验,结果证明了传统的类比关系式已不再适用减阻流动;对于水相减阻流动,湍流J_H<f/2,且热量传递系数减小的百分率远大于减阻百分率。

Addition of small amounts of certain polymeric materials to turbulent fluid flow not only causes a reduction in the friction coefficient, but also causes reductions in the heat and mass transfer coefficients, The turbulent heat transfer of polymer drag-reducing agent solutions in tubes is studied. Experimental results are compared with momentum transfer under the same conditions. A marked derease in heat transfer etticiency is observed in the case of Newtonian fluids. The decrease is greater than the corresponding drag reduction(J_H<f/2).The traditional analogies is found to be no longer in agreement with turbulent heat transfer and momentum transfer data in aqeous drag reducing fluids.