Reynolds analogy

Reynolds analogy relates turbulent momentum and heat transfer. The main assumption is that heat flux q/A in a turbulent system is analogous to momentum flux τ, which suggests that the ratio τ/(q/A) must be constant for all radial positions.

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The complete Reynolds analogy* is,

(f/2) = (h/C_p*G) = (k'_c/V_av)

Experimental data for gas streams agree approximately with above equation is the Schmidt and Prandtl numbers are near 1.0 and only skin friction is present in flow past a flat plate or inside a pipe. When liquids are present and/or form drag is present, the analogy is not valid.

See also

• Reynolds number
• Chilton and Colburn J-factor analogy

References

• Geankoplis, C.J. Transport processes and separation process principles(2003), Fourth Edition, p. 475.