Temperature Gradient Heat Transfer. Insulation is used to retard heat transfer by putting material with low heat conductivity next to the heat source. We can use the analogy between electrical and thermal conduction processes to simplify the representation of heat flows and thermal resistances.
There are three modes of heat transfer. Direct scale up for heat transfer is based on the heat transfer area that is a square law eq. Temperature gradient across a fouled plate heat exchanger wall.
All materials transfer heat through them at different rates.
A heat transfer coefficient h is generally defined as. It means that the temperature gradient is the ratio of the temperature difference between two points to the distance between these two points. Based on this strategy the heat transfer coefficients should be constant among scales to maintain the same melt temperature. The study of transport phenomena concerns the exchange of momentum energy and mass in the form of conduction convection and radiation.