A COMPREHENSIVE FRACTAL APPROACH IN DETERMINATION OF THE EFFECTIVE THERMAL CONDUCTIVITY OF GAS DIFFUSION LAYERS IN POLYMER ELECTROLYTE MEMBRANE FUEL CELLS MOHD FIKRI BIN AZIZAN A project report submitted in partial fulfillment of the requirement for the award of the Degree of Master of Mechanical Engineering Faculty of Mechanical and Manufacturing Engineering Universiti Tun Hussein Onn Malaysia JUN 2017