A plane wall of thickness L has thermal conductivity k. One side of the wall is cooled by a liquid with temperature T1 and heat transfer coefficient h1. The other side of the wall is heated by a gas with temperature T2 and heat transfer coefficient h2. What is the heat flux through the wall per unit area?

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A plane wall of thickness L has thermal conductivity k. One side of the wall is cooled by a liquid with temperature T<sub>1</sub> and heat transfer coefficient h<sub>1</sub>. The other side of the wall is heated by a gas with temperature T<sub>2</sub> and heat transfer coefficient h<sub>2</sub>. What is the heat flux through the wall per unit area?