The GATE Grind

GATE 2026 MT – Question 28

Transport Phenomena and Rate Processes · Heat transfer · 1 mark · Multiple choice

Which one of the following options is correct? For a solid immersed in a fluid, the convective heat transfer coefficient across the solid-fluid interface is NOT dependent on:

  1. Solid-fluid interfacial area
  2. Thermal conductivity of solid
  3. Roughness of solid surface
  4. Viscosity of fluid

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Show answer and explanation

Correct answer: (B) Thermal conductivity of solid

Explanation

The convective coefficient is determined by fluid properties, flow and boundary geometry: correlations use fluid conductivity, viscosity, velocity and characteristic size, with roughness affecting the boundary layer. The solid’s thermal conductivity governs conduction within the solid, not the external convection coefficient in this formulation. **B**.