What is the temperature gradient? Heat and mass transfer - W6WQ

As shown in the Schematic, the surface temperature of a steel wall and temperature of water flowing over the wall are given. The thermal conductivity of steel at the mean temperature of 70 ℃ is 61.7 W/m·K. The thermal conductivity of water at the mean temperature of 32.5 ℃ is 0.62 W/m·K. Determine the convection coefficient and temperature gradient in wall and in water at wall surface.

Answers: h = 705 W/m²K
dT/dx in wall = - 171.4 K/m
dT/dx in water @ wall = -17059 K/m

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