Heat transfer and entropy generation analyses associated with mixed electrokinetically induced and pressure-driven power-law microflows

Entropy Generation in Flow of Highly Concentrated Non-Newtonian Emulsions in Smooth Tubes

“…The solid lines shown in Figure 10 are the predictions of laminar model (Equation (27)) and the dashed lines represent the predictions of turbulent model (Equation (28)). Figures 11 and 12 show the plots of G S′  versus n Re_ data for 65.15% and 72.21% vol.…”

“…Equations (27) and (28) are the new predictive models for entropy generation per unit length in pipeline flow of non-Newtonian power-law fluids. These models could be applied to non-Newtonian (power-law) pseudo-homogeneous mixtures of two phases such as emulsions of oil and water.…”

“…The influence of consistency index K on entropy generation rate in flow of power-law fluids in a smooth tube is shown in Figure 2. The plots of G S′  versus n Re_ shown in the figure are generated from model Equations (27) and (28) Figure 3 shows a schematic diagram of the flow rig that was designed and developed to experimentally investigate of the rate of entropy generation in flow of emulsions in smooth tubes. Five different diameter tubes (stainless steel, seamless) were installed horizontally.…”

“…Figure 1 shows the effect of flow behavior index n on entropy generation rate in flow of non-Newtonian power-law fluids in a smooth tube. The plots of G S′  versus n Re_ are generated from model Equations (27) and (28) . The figure indicates that: (a) for a given value of n , the entropy generation rate G S′  increases linearly with the increase in generalized Reynolds number on a log-log scale, in both laminar and turbulent regimes.…”

“…It should be pointed out that a number of interesting research articles have been published recently on heat transfer and entropy generation in flow of Newtonian and non-Newtonian fluids [24][25][26][27][28][29][30][31][32][33]. Several published articles also deal with the fluid mechanics, thermodynamics, and stability of non-Newtonian fluids in different configurations [34][35][36].…”