An Experimental Study of Laminar Flow for Graphene Nanofluid in Double Micro Heat Exchanger

Abstract

In this paper, an experimental study was conducted on double micro –heat exchanger device for laminar heat transfer of the Graphene Nano platelets. The heat transfer, pressure drop and pumping power of Graphene Nano fluid were measured. First, the Nano fluid was prepared and the stability of the Nano fluid was measured, then the thermal properties (viscosity, density, and thermal conductivity) were measured experimentally in the laboratory at different concentrations (0.02, 0.055 and 0.06% wt.). In addition, the effect of weight fraction, inlet temperature and mass flow rate on logarithmic mean temperature difference and the overall heat transfer coefficient were evaluated in double micro–heat exchanger device. The final results showed that the overall heat transfer coefficient and effectiveness of double micro –heat exchanger device improved by raising the weight fraction of Graphene Nano platelets and the overall heat transfer coefficient improved to 51.1% at Reynolds number of 425 and weight concentration of 0.06% wt. The experimental results showed that pressure drop and pumping power were higher for (0.06% wt.) compared to (0.02%wt. and 0.055% wt.). Keywords—Nanofluid, Graphene, Double micro–heat exchanger.