Describe heat transfer systems with suitable examples.

Heat transfer systems are essential components in various food processing and engineering applications, where the transfer of heat is necessary to modify the temperature and state of food products. Heat transfer is a fundamental process in many unit operations, including pasteurization, cooking, drying, and freezing. The mechanisms of heat transfer include conduction, convection, and radiation, each with its own principles and applications.

Conduction is the process by which heat flows from a region of higher temperature to a region of lower temperature within a material or between materials in direct contact. The rate of heat transfer by conduction is governed by Fourier’s law, which states _________ ______ __________ _________ _____ _______ __________.
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