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3D FLOW SIMULATION OF A SHELL AND TUBE HEAT EXCHANGER WITH NANO-DIAMOND FLUID
Author :
Hamidreza Ghasemi Bahraseman, Cody Secor, Michael McDaniel, Chris Okimoto, Michael Guerero, Maxwell Thatcher and George Tanner
Corresponding Author:
Hamidreza Ghasemi Bahraseman
Email
hghasemibahraseman@sdsu.edu
Section :
Research Paper
Country :
United States
Keywords :
shell and tube heat exchanger, diamond nanofluid, forced convection, laminar, baffles
Abstract :
The purpose of this inspection is to identify the heat transfer effects of an incremental addition of diamond nanoparticles to hot engine oil in a structural steel shell and tube heat exchanger using forced convection to heat cooler air. The shell and tube heat exchanger is constructed with one tube containing hot engine oil, which is positioned symmetrically inside a larger tube containing colder air. The outlet air temperature was examined for relative changes in temperature for each concentration of nano-diamond added (i.e., 0, 0.5, 1.0, and 2.0% respectively). Additionally, a comparison study was performed to show the difference between a model with no baffles and a model with containing several baffles that demonstrate maximum efficiency for a pure oil control. The COMSOL simulation investigates the stationary laminar flow solutions for all cases considered. Dynamic viscosity, thermal conductivity, density, and specific heat are modified to simulate the various oil compositions; an experimental investigation from 2012, by M. Ghazvini, et.al [1], was used in obtaining the material properties for this report at 313.15 K. The simulation expresses a maximum increase in air outlet temperature of 1.06% and 0.98% for an engine oil additive of 2.0% nano-diamond. These percentages are respective of a no baffle model, and the baffle case that demonstrated maximum efficiency, 17 baffles. Additionally, the increase in outlet air temperature for pure oil between the two geometries was found to be 1.28%. These two methods to increase heat transfer efficiency are seen to have a comparable effect on this geometry.
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