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.
Highlights
Use of novel bidirectional microstructured surfaces in two-phase heat transfer application.
The implication of bidirectional-microstructured surfaces intensifies the two-phase heat transfer rate of Newtonian and Non-Newtonian fluid with shear thinning nature.
The heat transfer characteristics of bidirectional microstructured surfaces are analyzed based on their exposed surface area.
The new finding showed that an increase in the exposed area of the microstructured surfaces resulted in a decrease in heat transfer rate, in contrast to the general effect of surface area on heat transfer coefficient.
Disclosure statement
No potential conflict of interest was reported by the author(s).