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A double pipe heat exchanger is significant device for many industrial   applications. In this paper, an experimental study using both porous media   and nanofluid to enhance heat transfer in a double pipe heat exchanger is   performed. The test rig has been fabricated with inner copper pipe of 1.10m   length, 16mm and 14mm outside and inside diameter respectively. While, the   outer PVC pipe is 1m length, 31mm and 27mm outside and inside diameter   respectively. The inner pipe has been filling with 3mm diameters of steel   balls porous media. The experimental tests were performed utilizing alumina   nanofluid (Al2O3/water) with two volume concentrations 0.5% and 1%. The   volume flowrates are in the range of (2-5) liter/min and 10 liter/min   through inner and outer pipe respectively. It was conducted with a constant   28°C inlet temperature of cold fluid flow inside the inner pipe and 50°C   inlet temperature of hot fluid flow inside the outer pipe. Results indicated   that the heat transfer enhanced as nanofluid volume concentrations and   volume flowrates increase. It was observed that Effectiveness increases as   increase of flowrate and nanofluid concentrations.

Improving thermal performance using Al2O3-water nanofluid in a double pipe heat exchanger filling with porous medium