skin-friction coefficient

skin-friction coefficient

[′skin ¦frik·shən ‚kō·i′fish·ənt]
(meteorology)
A dimensionless drag coefficient expressing the proportionality between the frictional force per unit area, or the shearing stress exerted by the wind at the earth's surface, and the square of the surface wind speed.
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From Table 2, only the suction case has a strong effect on the local wall couple stress as well as the local skin-friction coefficient, whereas the local Nusselt number is slightly affected and the local Sherwood number remains insensitive to the three cases studied.
Simulations showing important flow characteristics such as the skin-friction coefficient, heat, and mass transfer rates will be carried out.
The important physical parameters for the type of boundary layer flow under consideration are the skin-friction coefficient, Nusselt number, and Sherwood number.
(vi) Thermal radiation parameter, permeability parameter, and slip parameter tend to enhance the translational velocity profiles throughout the boundary layer region and the skin-friction coefficient.
The physical quantities of interest of the problem are the skin-friction coefficient [C.sub.f] and the Nusselt number Nu, which can be expressed, respectively, as
(e) The magnitude of wall skin-friction coefficient decreases with Casson parameter [beta].
The parameters of engineering interest for the present problem are the local skin-friction coefficient and the local Nusselt number which indicate physically wall shear stress and rate of heat transfer respectively.
The quantities of physical interest, namely, the local skin-friction coefficient [Cf.sub.x] and the rate of heat transfer in terms of the local Nusselt number [Nu.sub.x], are presented by
Table 1: Values of skin-friction coefficient at the plate when [epsilon] = 0.2 [K.sub.0] Gr M Pr [omega] [C.sub.f] 0.3 4 5 0.71 4 1.12134 0.4 4 5 0.71 4 1.17966 0.3 8 5 0.71 4 2.24267 0.3 4 7 0.71 4 1.00651 0.3 4 5 1 4 1.01282 0.3 4 5 0.71 8 1.2693
The effects of various governing parameters on skin-friction coefficient [C.sub.f], Nusselt number Nu, and Sherwood number Sh are shown in Tables 1 and 2.
We observe from Table 1 that the skin-friction coefficient (-f'(0)) and the Nusselt number [N.sub.u] (= -[theta]'(0)) increase for increasing values of dimensionless activation parameter E for exothermic chemical reaction, but opposite actions are found for endothermic reaction.
Table 1 displays the values of the skin-friction coefficient and Nusselt number at the surface for different values of [[theta].sub.r].