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No convection heat transfer from hot fluid to cold solid

Question asked by Matthew Cherng on Mar 9, 2018
Latest reply on Mar 22, 2018 by Mark Keown

A 3kW heating plate was placed below an aluminum plate (initially 20C) contained in a box, where the bottom and top lids are set to atmospheric pressure allowing natural convection. However little to no heat transfer was observed during the 40 second transient flow simulation between the hot air in contact with the aluminum plate. How would I go about to fix this?