Nature-inspired Inverted Fish Scale microscale passages for enhanced heat transfer

Investigation of Variable Cross-Sectional Flow Area for an Enhanced Thermo-Hydraulic Performance in Microchannels

“…The methodology of implementing the microchannels is similar to the one adopted by [7][8][9][10][11][12]. A solid cylindrical insert with an external diameter of 19.4 mm is superimposed concentrically within a hollow cylindrical pipe with an internal diameter of 20 mm, yielding an annular gap of 300 µm as shown in Fig.…”

Convective heat transfer in microchannels with varying flow cross-section

“…The triangular wave profiles, named Durian profiles in the original article [12], depicted the highest thermo-hydraulic performance, as compared to the other profiles being investigated, which were fish-scale and inverted fish-scale profiles [10,11]. This Ph.D.…”

“…Inspired by the success of implementing microchannel by using conventional machining methods, Goh and Ooi [10] explored the possibility of achieving enhanced heat transfer by using similar methods. They adopted biomimicry in their design of the surface profile on the inner cylinder, as shown in Goh and Ooi [11] subsequently examined the effect of fish scale profile, as shown in The maximum thermo-hydraulic performance index reported is near to 1.67, achieved by the profile with the highest e/H ratio at a constant P/e ratio of 10.…”

“…An annulus can be conveniently approximated to a circular duct by using the concept of hydraulic or wetted diameter. Therefore, the measured friction factor is validated using Equation (2)(3)(4)(5)(6)(7)(8)(9)(10)(11) and (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12), as shown in Figure 3-11. The variation of viscosity in the measurement owing to the heating process has also been accounted for using Equation .…”

“…The need for a cost-effective and simple method of implementing microscale heat transfer motivated Kong and Ooi [8] to implement microscale channels by superimposing macro geometries, which were machined using readily-available conventional machining methods. As there was still a need for single-phase liquid cooling in microchannels while keeping the pressure drop low [9], Goh and Ooi [10][11][12] successfully achieved improved thermo-hydraulic performances using nature-inspired profiles, as compared to a straight microchannel. They adopted the similar methodology of implementing a microchannel as [8].…”