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• W2068458110 abstract "Both qualitative flow visualization as well as laser holographic interferometry and quantitative temperature measurement are presented for mixed convection of air layers in vertical channels (channels A and B) with asymmetrical discrete heated ribs, wherein the opposing flow is in channel A and the assisting flow is in channel B. In the case of opposing mixed convection flow, the main flow separates on the heated rib and the recirculatory secondary flow is produced in between two consecutive ribs. However, when the main flow assists buoyancy, the separation takes place on the cold wall and a secondary flow exists in a region away from the heated rib. Based on the analyses of the photographs and interferograms, it is found that, as GrlRe2 increases, the recirculation becomes stronger and the region becomes smaller for assisting flow (in channel B), whereas this change seems unclear for the opposing flow (in channel A). However, the heat transfer rates in channel A are consistently higher than those in channel B for the cases under investigation. The result might be useful for the thermal design configuration of coolings of electronic equipment. Nomenclature Ah = surface area of the rib, m2 C = isobaric specific heat, J/kg.K D = depth of channel in z direction, m Dh = hydraulic diameter, in Gr = Grashof number, .= gfi (Tw - T0)DHv2 g = acceleration due to gravity, m/s2 H = height of the channel, m h = local heat transfer coefficient, = QJAh(Tw - T 0) k = thermal conductivity, W/m.K L = length of the channel, = 2H, m L! = length of the heated rib, m L2 = length of the unheated plate, m Nu = Nusselt number, = hDhlk Nuy = local Nusselt number, based on local height, measured from top of channel A/bottom of channel B to midheight of heated rib Pr = Prandtl number, = via Q = power input per heated rib, W <2c = convective heat transfer rate, W QL - conduction heat loss, W Qr = radiation heat loss, W Qsc = substrate conduction heat transfer rate, W Q, = total power input to each test rib, W Re = Reynolds number, = VDhlv T = temperature, °C 7} = reference fluid temperature, = 0.5 (Tw + T 0), °C T0 = inlet temperature of air, °C Tw = local temperature of the heated rib, °C V = inlet velocity of air, m/s W = width of the channel, m ;c, v, z = Cartesian coordinates, m a = thermal diffusivity, = k/pC, m2/s j8 = volumetric coefficient of expansion, 1/k v — kinematic viscosity, m2/s p = density, kg/m3" @default.
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• W2068458110 date "1991-07-01" @default.
• W2068458110 modified "2023-09-27" @default.
• W2068458110 title "Mixed convection of opposing/assisting flows in vertical channels with discrete asymmetrically heated ribs" @default.
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• W2068458110 doi "https://doi.org/10.2514/3.279" @default.
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