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GATE 2026 Chemical Engineering, Q14 · Heat Transfer

The correct answer is B, buoyancy force to viscous force.

Question

Which one of the following ratios does Grashof number represent?

  • A. buoyancy force to inertia force
  • B. buoyancy force to viscous force
  • C. viscous force to capillary force
  • D. viscous force to inertia force

Official answer: buoyancy force to viscous force

Why

GATE 2026 official key: (B). Gr =gβΔTL3/ν2= gβ\Delta TL³/ν² compares the buoyancy force driving natural convection to the viscous force resisting it.

Explanation cross-checked for consistency. Final answer matches the official IIT answer key.

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