Effects of roughness elements on laminar flow and heat transfer in microchannels

Electromagnetohydrodynamic (EMHD) flow between two transversely wavy microparallel plates

“…For microchannel, the relative roughness (the ratio of roughness height to hydraulic diameter of microchannel) is much larger than that in macrochannel. Therefore, the influence of surface roughness of microchannel on flow characteristics should be considered. So far, there has been no published work regarding EMHD flow in a microchannel with transverse sinusoidal wall corrugations.…”

Numerical simulation of heat transfer and friction in non-uniform wall roughness lattice with different roughness element shapes

“…It is concluded that the wedge transverse ribs have relatively lesser chance to form eddies behind the ribs which reduce the heat transfer and lead to a substantially larger enhancement of heat transfer rate. A model of laminar flow and heat transfer in rough microchannels is developed and analyzed numerically to compare the effect of roughness element shapes on the thermal and hydrodynamic characteristics by Zhang et al (2010). They found that the influence of the rectangular roughness element height is weaker than that of the semicircular and triangular element.…”

Heat and mass transfer characteristics of leaf-vein-inspired microchannels with wall thickening patterns

“…Furthermore, after several experimental explorations, Tang et al [7][8][9] claimed that the roughness effect cannot be ignored if the relative roughness height is larger than 1% in microchannels. Interest on the effect of roughness on the laminar flow and heat transfer in microchannels has been constantly growing for many years, but the mechanisms of laminar flow and heat transfer in rough microchannels have not yet been fully revealed [10]. KharatiKoopaee and Zare [11] aimed at numerical study of the effect of aligned and offset roughness patterns on the fluid flow and heat transfer phenomenon within rectangular cross section microchannels containing structured sinusoidal roughness.…”

“…An increase in the Poiseuille number and Nusselt number was observed simultaneously. Zhang et al [10] developed a model of laminar flow and heat transfer in rough microchannels and then analyzed numerically to compare the effect of roughness elements on the thermal and hydrodynamic characteristics. Differing from the smooth microchannels, both http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.05.120 0017-9310/Ó 2016 Elsevier Ltd. All rights reserved.…”