### ME6502  HMT Notes

Anna University Regulation 2013 Mechanical Engineering (MECH) ME6502  HMT Notes for all 5 units are provided below. Download link for MECH 5th SEM ME6502  HEAT AND MASS TRANSFER  Lecture Notes are listed down for students to make perfect utilization and score maximum marks with our study materials.

ME6502 – HEAT AND MASS TRANSFER

INTRODUCTORY CONCEPTS AND BASIC LAWS OF HEAT TRANSFER

We recall from our knowledge of thermodynamics that heat is a form of energy transfer that takes place from a region of higher temperature to a region of lower temperature solely due to the temperature difference between the two regions.

With the knowledge of thermodynamics we can determine the amount of heat transfer for any system undergoing any process from one equilibrium state to another. Thus the thermodynamics knowledge will tell us only how much heat must be transferred to achieve a specified change of state of the system.

But in practice we are more interested in knowing the rate of heat transfer (i.e. heat transfer per unit time) rather than the amount. This knowledge of rate of heat transfer is necessary for a design engineer to design all types of heat transfer equipments like boilers, condensers, furnaces, cooling towers, dryers etc. The subject of heat transfer deals with the determination of the rate of heat transfer to or from a heat exchange equipment and also the temperature at any location in the device at any instant of time.

The basic requirement for heat transfer is the presence of a ―temperature difference‖. The temperature difference is the driving force for heat transfer, just as the voltage difference for electric current flow and pressure difference for fluid flow. One of the parameters , on which the rate of heat transfer in a certain direction depends, is the magnitude of the temperature gradient in that direction. The larger the gradient higher will be the rate of heat transfer.

Heat Transfer Mechanisms :-

There are three mechanisms by which heat transfer can take place. All the three modes require the existence of temperature difference. The three mechanisms are: (i) conduction, (ii) convection and (iii) radiation

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