Enhancement of heat transfer in internal passages is always preferred in variety of applications like combustion chamber, cooling of gas turbine blades, compact heat exchangers and solar air heater etc. Several attempts have been made on enhancement of heat transfer which is broadly classified in two categories namely active and passive techniques. One of the well-known passive methods of enhancing the heat transfer is to roughen the heat transfer surface artificially by the use of repeated

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... sverse or inclined ribs to the flow. This project work is carried to perform experimental evaluation of heat transfer evaluation in a compact rectangular duct by using the rib roughened surface. We have used the square rib roughened surface on the top face of rectangular channel, which will increase the heat transfer rate. Also we will change the inclination of square rib pattern enhancement in the heat transfer rate will be determined.