LAUSR

lt is generally observed that solar air heater has lower conversion efficiencies due to low density of the working substance i.e. air. Hence many researchers arc working hard to improve the performance hy various design changes for the absorber itself. However. there is scope for improving the performance by means of surface morphology of the duct such that the 0011' may be made to accelerate and decelerate in the duct, This will result in a momentum exchange among the heated air particles. In this paper the width-wise dimension is morphed such that the duct takes the shape of a converging as well as a diverging passage. Converging shapes of the absorber plate result in an improved enthalpy augmentation due to an increase ill the kinetic energy of the medium. Several parametric configurations of the converging and diverging ducts corresponding: to various convergence ratios and divergence ratios arc studied under different mass now rate considerations so as to bring out an optimum design of the morphcd duct