Thermal performance of a miniature loop heat pipe using water–copper nanofluid

Wan, Zhenping; Deng, Jun; Li, Bin; Xu, Yanxiao; Wang, Xiaowu; Tang, Yong

doi:10.1016/j.applthermaleng.2014.11.010

Cited by 93 publications

(30 citation statements)

References 25 publications

(19 reference statements)

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“…Re=  D (13) where D is the inside diameter of the tube (or pipe), υ is the average velocity of the fluid, ρ is the density of the fluid and μ is its dynamic viscosity.…”

Section: Discussionmentioning

confidence: 99%

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Influence of low concentration of diamond water nanofluid in loop heat pipe

Aun

Abdullah

Gunnasegaran³

2017

IJHT

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There are various analyses performed to study the heat transfer performance of nanofluid as working fluid in the heat pipe. The studies include the different viscosity, density, specific heat and thermal conductivity effects. However, to consider in terms of cost of material, high thermal efficiency particle with high concentration, for example, gold and diamond would cost higher even though it shows good thermal performance as compared to other nanoparticles. In this research, an experiment is conducted to investigate the heat transfer characteristics by using low concentrations of diamond water, which is less than 1% in Loop Heat Pipe (LHP). The nanofluid consists of three types of mass concentration which is 0.3%, 0.6% and 0.9%. There are two conditions to study the effect of nanofluid to heat transfer performance on LHP in this experiment. The conditions are different flow rate and different heat load application. The LHP performance is evaluated in terms of total thermal resistance (Rt) of LHP, heat transfer coefficient of evaporator and transient temperature distribution. To justify the experiment, the results were compared with ANSYS simulation, which found in good agreement. The significant gain from this experiment is the ability to prove that low concentration of diamond attains higher heat transfer coefficient than water. At the same time, the bubble flow patterns of diamond water in vapor line are found to be smaller than water which indicate higher heat transfer characteristic for working fluid compared with pure water. Thus, there is a potential for low concentration of diamond water nanofluid to be utilized as working fluid, in terms of cost, than using mass concentration of more than 1%.

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“…Re=  D (13) where D is the inside diameter of the tube (or pipe), υ is the average velocity of the fluid, ρ is the density of the fluid and μ is its dynamic viscosity.…”

Section: Discussionmentioning

confidence: 99%

“…Wan [13] experimentally investigated the influence of a nanofluid on the thermal characteristics of a specially designed miniature Loop Heat Pipe mLHP and explored the mechanism of heat transfer enhancement of the nanofluid in the mLHP. The nanofluid was composed of deionized water and Cu nanoparticles and had an average diameter of 50 nm.…”

Section: Introductionmentioning

confidence: 99%

Influence of low concentration of diamond water nanofluid in loop heat pipe

Aun

Abdullah

Gunnasegaran³

2017

IJHT

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“…The first research about the application of nanofluids in heat pipe was published by Chien et al [9].Since then; many articles about different types of heat pipe using nanofluids have been published. One of the most important results of these studies [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], is an increase in the maximum heat load and decrease in the thermal resistance in heat pipe. Maryam Shafahi et al [3,10], showed that the use of nanofluids in the flat-shaped heat pipe and cylindrical heat pipe decreases the temperature difference along the heat pipe, and reduces the speed of the liquid, and also it provides the possibility of reduction in heat pipe size under the same condition.…”

Section: Main Effects Of Nanofluids On Heat Pipesmentioning

confidence: 99%

“…In practice, high concentration of nanoparticles also leads to sedimentation and blocking of the wicking material. Furthermore, the existence of nanoparticles within the working fluid provides nucleation sites and the bombardment of vapor bubbles, which improves heat transfer rates and pushes back the boiling limit [16,13,15]. nanofluids improve the wettability and the capillary pumping pressure, so the capillary limit is pushed back by using nanofluids as working fluid.…”

Section: Main Effects Of Nanofluids On Heat Pipesmentioning

confidence: 99%

Nanofluids and heat pipe limitations

Mekcem¹

2018

acperpro

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Given the high efficiency of heat pipes as heat transfer devices, which work with phase changing principle (evaporation and condensation) and without requiring any external energy input, the heat pipes have been utilized for many years in several areas. However, heat transfer in heat pipes is limited by physical phenomena which appear during its operation, called heat pipe limitations; these can limit and reduce its performance. At this state, the use of nanofluids instead of conventional fluids come a solution after that Choi and Eastman (1995) confirmed the feasibility of enhancing the thermal conductivity of fluids by adding nanoparticles. This paper represents a general description of heat pipes, including a brief historical perspective, principle of operation and explanation of main heat transfer limitations. The work shows the contribution of nanofluids in pushing back the heat transfer limitations

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“…The research on application of nanofluids in heat pipes was firstly published in 2003 [6]. Many articles have been published since then, involving micro-grooved heat pipe, mesh wick heat pipe, sintered metal wick heat pipe, oscillating heat pipe (OHP), and loop heat pipe (LHP) [7][8][9][10][11][12]. The applied nano-materials included metal, metal oxides, diamond, carbon nanotubes and several other materials.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer in a Loop Heat Pipe Using Fe₂NiO₄-H₂O Nanofluid

2017

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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 Fe2NiO4-H2O 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 5.75 o C (14%) was achieved in core temperatures of desktop PC CPU charged with Fe2NiO4-H2O 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.

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Thermal performance of a miniature loop heat pipe using water–copper nanofluid

Cited by 93 publications

References 25 publications

Influence of low concentration of diamond water nanofluid in loop heat pipe

Influence of low concentration of diamond water nanofluid in loop heat pipe

Nanofluids and heat pipe limitations

Heat Transfer in a Loop Heat Pipe Using Fe₂NiO₄-H₂O Nanofluid

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Thermal performance of a miniature loop heat pipe using water–copper nanofluid

Cited by 93 publications

References 25 publications

Influence of low concentration of diamond water nanofluid in loop heat pipe

Influence of low concentration of diamond water nanofluid in loop heat pipe

Nanofluids and heat pipe limitations

Heat Transfer in a Loop Heat Pipe Using Fe2NiO4-H2O Nanofluid

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Product

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Heat Transfer in a Loop Heat Pipe Using Fe₂NiO₄-H₂O Nanofluid