Specific heat, coefficient of viscosity, and thermal conductivity are related in the
Options:
(A) Prandtl number
(B) Reynolds number
(C) Froude number
(D) Biot number
Official Answer Key:
A
Step-by-Step Solution & Explanation
Prandtl number, Pr = c_p μ/k — the only group that contains all three of the named properties. Physically it is the ratio of momentum diffusivity (ν = μ/ρ) to thermal diffusivity (α = k/ρc_p), and it determines the relative thickness of the velocity and thermal boundary layers.
The others do not qualify:
- Reynolds, Re = ρvD/μ — contains viscosity but neither c_p nor k.
- Froude, Fr = v/√(gL) — purely kinematic; contains none of the three.
- Biot, Bi = hL/k — contains thermal conductivity but neither c_p nor μ.
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