Numerical study on mixed convection from a constant wall temperature circular cylinder in zero-mean velocity oscillating cooling flows

Experimental and numerical investigations on a solar tracking concentrated photovoltaic–thermal system with a novel non-dimensional lattice Boltzmann method

“…The forced convection can be ignored if Ri > 100, and the natural convection can be is negligible when Ri < 0:01. These observations are consistent with the results of mixed convection of oscillating flows over a circular cylinder based on the projection method of Su et al (2013a). The optimal design for the height of the inlet and outlet positions is to put the inlet near the top PV and outlet near the bottom glass, which will improve the heat carried away by the cooling fluid.…”

“…The present simulations results are consistent with the previous study of Su et al (2013a). In particular, when Ri > 1, the mixed convection is dominated by natural convection, and the mixed convection is dominated by forced convection when Ri < 1.…”

“…D2Q9 scheme is chosen in the present study because the previous studies show that two dimensional simulations can capture the heat transfer coefficient as well as three dimensional study although fluid patterns may change from spirals to recirculations (Su et al, 2013a). For the present problem, the macroscopic length scale is the gap height of the channel, H. The fluid domain is meshed in size of n  m, then the mesh size for both the solid and fluid part is n  mð1 þ 2H s =H Þ, where H s is the thickness of the covered glass and also the thickness of the PV panel.…”

A Non-Dimensional Lattice Boltzmann Method for direct and porous medium model simulations of 240-tube bundle heat exchangers in a solar storage tank

“…Previous studies show that 2D simulations capture the heat transfer coefficient as well as 3D simulations although the predicted fluid patterns may change from spirals to recirculations [33]. For the present problem, the macroscopic length scale is the width of the tank L. The enclosure domain is meshed in size of m  n, then the lattice mesh size, the length scale for NDLBM simulations, is…”

Periodic self-modulation of an electrodynamically driven heated wire near resonance

“…4. Several alternative approaches were examined for pulsating flows [39][40][41][42] as well as King's laws used for hot-wire anemometry 43 that has been applied to oscillating air flow in the Rijke tube. 44 All correlations produced similar results with a power-law dependence of the heat transport upon velocity, v n , where 0.4 n 0.5.…”