The heat transfer coefficient is significant in the design of equipment and processes which must be carefully evaluated and used. For example, the coefficient value defines to a great extent the equipment size and also establishes the contacts between phases and processing time. The value of the heat coefficient is traditionally obtained by calculation or experimentation. It is the average of the precise coefficients throughout equipment. The evaluation of the heat transfer coefficient by calculation involves a dimensional relationship obtained by geometry and determined thermal and flow conditions. Sometimes, these have been determined originally by mass transfer and others by heat transfer