Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

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Q. Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

(A) Grashoff
(B) Reynolds
(C) Both 'a' & 'b'
(D) Prandtl & Grashoff

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✅ Correct Answer: (D) Prandtl & Grashoff

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