ABSTRACT

An experimental investigation is conducted to study the two-phase heat transfer behavior of a shear-thinning Non-Newtonian (NN) fluid, i.e., “Massecuite,” at atmospheric pressure over bi-directional microstructured surfaces for the heat flux range from 70 to 200 kW/m². Two-phase heat transfer characteristics of a Newtonian Fluid, that is, distilled water, is also studied for the sake of comparison. Both aqueous XG solution and water exhibit higher heat transfer rate over microstructured surfaces as compared to plain surface. The heat transfer coefficient (HTC) of aqueous XG solution was found to increase over the microstructured surface from B-90-3-2-0.4-R to B-90-3-2-0.4-C to B-60-3-2-0.4-Nil. An enhancement of 83.35% is observed in the aqueous XG solution’s two-phase HTC over a bi-directional inclined tunnel-based microstructure surface (B-60-3-2-0.4-Nil) compared to the plain surface.

摘要

进行了一项实验研究，以研究剪切稀化非牛顿 (NN) 流体（即“糖膏”）在大气压下在双向微结构表面上的两相传热行为，热通量范围为 70 至200千瓦/米²。为了进行比较，还研究了牛顿流体（即蒸馏水）的两相传热特性。与普通表面相比，XG 水溶液和水在微结构表面上都表现出更高的传热速率。发现 XG 水溶液的传热系数 (HTC) 在微结构表面上增加，从 B-90-3-2-0.4-R 到 B-90-3-2-0.4-C 到 B-60-3- 2-0.4-无。与普通表面相比，在双向倾斜隧道微结构表面 (B-60-3-2-0.4-Nil) 上观察到 XG 水溶液的两相 HTC 提高了 83.35%。