“…To reduce the pressure drop without surrendering heat transfer enhancement, two possible techniques are effective; first using porous media in partly filled arrangement and second by varying the structural properties such as permeability. The related characteristics study, on partly filled channels and variable permeability, can be found in N.J. Rabadi [6], T.V. Morosuk [7], Ould-Amer et al [8], Prasad and Simmons [9], S.Y.…”