Thermal performance of inclined screen mesh heat pipes using silver nanofluids

Ghanbarpour, Morteza; Nikkam, Nader; Khodabandeh, Rahmatollah; Toprak, Muhammet S.

doi:10.1016/j.icheatmasstransfer.2015.06.009

Cited by 57 publications

(10 citation statements)

References 37 publications

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“…The first technique employs addition of nanoparticles to the working fluid to increase its thermal conductivity and enhance heat pipe performance. Different studies have investigated the effect of using various nanoparticles with water such as CuO nanoparticles (Yang et al 2008;Liu et al 2010;Manimaran et al 2012;Cheedarala et al 2016), Al2O3 nanoparticles (Noie et al 2009;Aly et al 2017), silver nanoparticles (Paramatthanuwat et al 2010;Ghanbarpour et al 2015), iron oxide nanoparticles (Huminic et al 2011;Huminic & Huminic 2013), graphene nanoparticles (Sadeghinezhad et al 2016) and multiwalled carbon nanotubes functionalized with ethylenediamine EDA-MWCNT nanoparticles (Shanbedi et al 2012a). It was found that the best nanoparticles concentration which provided the highest thermal performance was 1.0wt% (Yang et al 2008;Shanbedi et al 2012b), 0.1wt% (Sadeghinezhad et al 2016), 0.06wt% (Cheedarala et al 2016) and 3wt% (Aly et al 2017).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Enhancing thermal performance of a two-phase closed thermosyphon with an internal surface roughness

Alammar

Al-Mousawi

Al-Dadah

et al. 2018

Journal of Cleaner Production

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Section: Accepted Manuscriptmentioning

confidence: 99%

Enhancing thermal performance of a two-phase closed thermosyphon with an internal surface roughness

Alammar

Al-Mousawi

Al-Dadah

et al. 2018

Journal of Cleaner Production

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“…It has been widely accepted that an insufficient or excessive inclination angle could harm the heat pipe performance [30]. An insufficient inclination angle may induce a poor return of backflow to the evaporator [52], while an excessive inclination angle will reduce the heat dissipation efficiency by decreasing the heat exchange time at the condenser [31,52]. However, a quantitative prediction of the optimal inclination angle is still lacking.…”

Section: Mechanisms Of the Effect Of Inclination Angle On Heat Pipe Pmentioning

confidence: 99%

Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

et al. 2018

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Featured Application: solar collector; solar thermal system; thermal energy storage system; heat exchanger.Abstract: A micro heat pipe array is desirable owing to its high heat transfer capacity, compact size, and high surface-volume ratio compared with conventional heat pipes. In this study, micro flat aluminium heat pipe arrays (MF-AHPA) were developed and systematically characterised by varying working fluid and inclination angle. Three MF-AHPAs with different working fluids, i.e., acetone, cyclopentane, and n-hexane, were fabricated. The acetone MF-AHPA achieved the best thermal performance. The underlying mechanism is the small flow viscous friction and small shearing force of liquid vapour. Additionally, the experimental results show a strong dependence of MF-AHPAs' thermal resistance on the orientation due to the gravitational effect on axial liquid distribution. Finally, a criterion is proposed to determine the optimal inclination angle of the MF-AHPA. In the present study, a volumetric fraction (α a,c ) of 74 ± 7% has been shown to well predict an optimal inclination angle of the MF-AHPAs with various working fluids and heat loads.

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“…Typically, a 0° orientation is considered to be horizontal and angles from 0° to 90° relate to an inclined orientation with the condensing part above the evaporating part. With respect to the inclination angle, values between 40° -60° were typically found to be optimal regarding the HP performance [17][18][19], although other researchers report a slightly higher optimal angle with a value of 75° [20]. In case of transient behavior of a HP, it was found that the inclination of 15° decreases the required input power during the startup [21].…”

Section: Introductionmentioning

confidence: 98%

Experimental and numerical heat transfer analysis of heat-pipe-based CPU coolers and performance optimization methodology

Može

Nemanič

Poredoš

2020

Applied Thermal Engineering

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This paper presents an experimental and numerical heat transfer analysis of heat-pipe-based CPU coolers and a performance optimization methodology. The first part of the study focuses on the performance of two commercial HP-based CPU coolers under inclination angles of 0°, 90° and 180°. The results show that the 90° orientation provides the best thermal performance. The influence of heat pipe orientation on the performance of the entire system is obscured due to the much higher thermal resistance on the air-side of the cooler. A fourfold increase in air volumetric flow rate has only a minor effect on the cooling performance enhancement with a reduction of the thermal resistance from 0.11 K W-1 to 0.074 K W-1 at the highest heating power. In the second part of the study, heat transfer numerical simulations of the finned part of a cooler were performed and validated using experimental results. The output of the simulation is a 2-D temperature field, which is used as an input for the optimization methodology based on fin effectiveness and fin efficiency. Optimizing the fin geometry by removing unnecessary material yielded a 23% increase of the fin efficiency and decreased the weight of a fin by approx. 30%, proving the usefulness of the proposed methodology, which helps reduce costs, weight and development time of finned HP-based coolers.

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Thermal performance of inclined screen mesh heat pipes using silver nanofluids

Cited by 57 publications

References 37 publications

Enhancing thermal performance of a two-phase closed thermosyphon with an internal surface roughness

Enhancing thermal performance of a two-phase closed thermosyphon with an internal surface roughness

Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

Experimental and numerical heat transfer analysis of heat-pipe-based CPU coolers and performance optimization methodology

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