Abstract
Nanofluids are stable suspensions of nano fibers and particles in fluids. Recent investigations show that thermal behavior of these fluids, such as improved thermal conductivity and convection coefficients are superior to those of pure fluid or fluid suspension containing larger size particles. The use of enhanced thermal properties of nanofluids in a loop heat pipe (LHP) for the cooling of computer microchips is the main aim of this study. Thus, the Fe 2 NiO 4 -H 2 O served as the working fluid with nanoparticle mass concentrations ranged from 0 to 3 % in LHP for the heat input range from 20W to 60W was employed. Experimental apparatus and procedures were designed and implemented for measurements of the surface temperature of LHP. Then, a commercial liquid cooling kit of LHP system similar as used in experimental study was installed in real desktop PC CPU cooling system. The test results of the proposed system indicate that the average decrease of 5.75oC (14%) was achieved in core temperatures of desktop PC CPU charged with Fe 2 NiO 4 -H 2 O as compared with pure water under the same operating conditions. The results from this study should find it’s used in many industrial processes in which the knowledge on the heat transfer behavior in nanofluids charged LHP is of uttermost importance.
Highlights
Nanofluids are stable suspensions of nano fibers and particles in fluids
The objective of the current study is to evaluate the total thermal resistance (Rth) and the temperature distributions of the loop heat pipe (LHP) using pure water and Fe2NiO4-H2O nanofluid as working fluids for various heat inputs under steady state and transient conditions
Experimental investigation on Fe2NiO4-H2O nanofluid flow and heat transfer characteristics in LHP are reported in this study
Summary
Nanofluids are stable suspensions of nano fibers and particles in fluids. Recent investigations show that thermal behavior of these fluids, such as improved thermal conductivity and convection coefficients are superior to those of pure fluid or fluid suspension containing larger size particles. Most of the previous works considered on conventional heat pipes such as micro-grooved heat pipe, mesh wick heat pipe and oscillating heat pipe, and there is far less work conducted for LHPs. As LHPs are demonstrated to be a reliable and great potential for electronic cooling applications, the use of nanofluids could represent a gain in their performance by adding a certain volume of nanoparticles to the working fluid. In the realm of electronics cooling, some companies are conducting research to use nanofluids instead of water for cooling CPUs in desktop computers. In the present study, all the aforementioned issues on application of nanofluid in LHP are addressed experimentally and a real computer setup with a quad-core processor has been used to determine the effect of use of Fe2NiO4H2O nanofluid on the cooling system in real practical condition
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