Experimental investigation of the impact of elastic turbulence on heat transfer in a serpentine channel
Experimental investigation of the impact of elastic turbulence on heat transfer in a serpentine channel
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DOI：
10.1016/j.jnnfm.2016.03.003
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发表时间：
2016-05-01
影响因子：
3.1
通讯作者：
Poole, Robert J.
中科院分区：
文献类型：
--
作者：
Abed, Waleed M.;Whalley, Richard D.;Poole, Robert J.
实验研究了剪切变稀和等粘度Boger溶液两组聚合物粘弹性流体在方形截面蛇形通道内的对流换热和流动特性。流动的高分子量聚合物溶液中产生的弹性应力与流线曲率之间的非线性相互作用可以产生弹性湍流。为了确认这种几何形状中的弹性湍流，测量了蛇形通道上的压降。研究结果表明，在Weissenberg数为4 ~ 211的范围内，粘弹性溶液的无因次压降测量值比牛顿流体的无因次压降测量值增加约1.48 ~ 4.82。对流传热增强由于弹性湍流高达200%的低聚合物浓度（稀）的解决方案，并达到高达380%的更高的聚合物浓度（半稀）的解决方案相比，在蠕变流动条件下实现的等效牛顿流体流在低Graetz数（高达14.6）。我们提出了一个修改后的Weissenberg数，这是能够近似崩溃的平均努塞尔数数据为每个解决方案组。(C)2016年6月，作者。由Elsevier B. V.发布，这是CC BY许可下的开放获取文章。
The characteristics of convective heat transfer and fluid flow within a square cross-section serpentine channel are experimentally studied for two groups of polymeric viscoelastic fluids, shear-thinning and constant-viscosity Boger solutions. The elastic turbulence can be created by the non-linear interaction between elastic stresses generated within the flowing high-molecular-weight polymer solutions and the streamline curvature. In order to confirm elastic turbulence in this geometry, pressure drop across the serpentine channel was measured. The findings indicate that the measurements of non-dimensional pressure-drop increase approximately from 1.48 to 4.82 for viscoelastic solutions compared with the Newtonian fluid over a range of Weissenberg number from 4 to 211. The convective heat transfer enhances due to elastic turbulence by up to 200% for low polymer concentration (dilute) solutions and reaches up to 380% for higher polymer concentration (semi-dilute) solutions under creeping-flow conditions in comparison to that achieved by the equivalent Newtonian fluid flow at low Graetz number (up to 14.6). We propose a modified Weissenberg number which is able to approximately collapse the mean Nusselt number data for each solution group. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.