WebJun 27, 2024 · A constant-heat-flux heating element was placed inside each duct to provide the heat flux. General correlations are obtained for two duct orientations using the local perimeter-averaged heat transfer data given by Eqs. (7) and (8): Nux = 0.429(Ra ∗ x)0.241, 2.0 × 108 ≤ Ra ∗ x ≤ 1.0 × 1012 E7. WebMay 22, 2024 · A Nusselt number of Nu=1 for a fluid layer represents heat transfer across the layer by pure conduction. The larger the Nusselt number , the more effective the …
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In fluid mechanics (especially fluid thermodynamics), the Grashof number (Gr, after Franz Grashof ) is a dimensionless number which approximates the ratio of the buoyancy to viscous forces acting on a fluid. It frequently arises in the study of situations involving natural convection and is analogous to the … See more Heat transfer Free convection is caused by a change in density of a fluid due to a temperature change or gradient. Usually the density decreases due to an increase in temperature and … See more The first step to deriving the Grashof number is manipulating the volume expansion coefficient, $${\displaystyle \mathrm {\beta } }$$ as … See more • Cengel, Yunus A. (2003). Heat and Mass Transfer: A Practical Approach (3rd ed.). Boston: McGraw Hill. • Eckert, Ernst R. G.; Drake, Robert M. (1972). Analysis of Heat and Mass Transfer. New York: McGraw Hill. See more The Rayleigh number, shown below, is a dimensionless number that characterizes convection problems in heat transfer. A critical value exists for the Rayleigh number, above which fluid motion occurs. The ratio of the Grashof number to the square of the See more In a recent research carried out on the effects of Grashof number on the flow of different fluids driven by convection over various surfaces. Using slope of the linear regression line … See more WebApr 11, 2024 · Finally, the surface averaged Nusselt number is plotted in Figure 13, Figure 14 for a range of values of the Grashof number (10, 10 4, 10 5), Prandtl number (1 to 100) and for 1 ≥ n ≥ 0.2 for the constant surface temperature and the constant heat flux condition prescribed on the surface of the vertical plate. As remarked earlier, the heat ... fluff post
Nusselt number - Wikipedia
WebThe heat flux in the radial direction in the heating chamber was restricted by the insulation layer, resulting in the majority of the heat flux flowing in one direction towards to test surface. ... Grashof number (Gr), the ratio between buoyancy and viscous force; and Bond number (Bo), the ratio between buoyancy and surface tension. These ... WebFeb 2, 2011 · Grashof number, Gr, is a nondimensional parameter used in the correlation of heat and mass transfer due to thermally induced natural convection at a solid surface … WebAverage Nusselt Number can be formulated as: Nu = Convective heat transfer / conductive heat transfer. Nu = h/ (k/L c) Nu = hL c /k. where h = convective heat transfer coefficient of the flow. L = the characteristic length. k = the thermal conductivity of the fluid. The Local Nusselt Number is represented as. fluff prompt list