A descriptive review of the thermal transport mechanisms in mono and hybrid nanofluid-filled heat pipes and current developments

Pandey, Harshit; Gupta, Naveen Kumar

doi:10.1016/j.tsep.2022.101281

Cited by 15 publications

(5 citation statements)

References 74 publications

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“…Both metallic and non-metallic nano-fluids are prepared by suspending a single nanoparticle in a base solution to obtain a stable suspension. Mixed nano-fluids are made up of two or more different nano-particles [99]. Zufar et al [100] studied the thermal performance of Al 2 O 3 -CuO/water mixed nano-fluids (0.1 wt.%) and SiO 2 -CuO/water mixed nano-fluids (0.1 wt.%) under different heat inputs (10-100 W) with the liquid filling rates of 50-60%.…”

Section: Mixed Nano-fluidmentioning

confidence: 99%

A Review of Working Fluids and Flow State Effects on Thermal Performance of Micro-Channel Oscillating Heat Pipe for Aerospace Heat Dissipation

Xin

Jiang

et al. 2023

Aerospace

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A MCOHP (micro-channel oscillating heat pipe) can provide lightweight and efficient temperature control capabilities for aerospace spacecraft with a high power and small size. The research about the heat flow effects on the thermal performance of MCOHPs is both necessary and essential for aerospace heat dissipation. In this paper, the heat flow effects on the thermal performance of MCOHPs are summarized and studied. The flow thermal performance enhancement changes of MCOHPs are given, which are caused by the heat flow work fluids of nano-fluids, gases, single liquids, mixed liquids, surfactants, and self-humidifying fluids. The use of graphene nano-fluids as the heat flow work medium can reduce the thermal resistance by 83.6%, which can enhance the maximum thermal conductivity by 105%. The influences of gravity and flow characteristics are also discussed. The heat flow pattern changes with the work stage, which affects the flow mode and the heat and mass transfer efficiency of OHP. The effective thermal conductivity varies from 4.8 kW/(m·K) to 70 kW/(m·K) when different gases are selected as the working fluid in OHP. The study of heat flow effects on the thermal performance of MCOHPs is conducive to exploring in-depth aerospace applications.

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Section: Mixed Nano-fluidmentioning

confidence: 99%

A Review of Working Fluids and Flow State Effects on Thermal Performance of Micro-Channel Oscillating Heat Pipe for Aerospace Heat Dissipation

Xin

Jiang

et al. 2023

Aerospace

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“…Isı borularında çalışma sıvısı olarak farklı temel akışkanlar ve nanoakışkanlar kullanılmaktadır. Nanoakışkanlar, temel akışkan ile karşılaştırıldığında benzersiz termofiziksel özelliklere sahip akışkanlardır; nanoakışkanların kullanımı viskoziteyi arttırır, ancak düşük konsantrasyonlu nanoakışkanların kullanımı temel akışkanın ısı transfer performansını iyileştirir [20], [21] [32].…”

Section: Introductionunclassified

Isı Borularında Nanoakışkan Uygulamaları

Dumrul

2023

ICSIS

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Nanoakışkanlar, farklı tipteki ısı borularının ısı transfer performansını etkili bir şekilde artırabilir.Farklı nanopartiküller, konsantrasyonlar, paketleme oranları, eğim açıları ve ısıl yükler gibi önemlideğişkenlerin ısı borusu performansı üzerindeki etkisi bu çalışmada anlatılmıştır. Çalışmalar, daha verimlikullanım için belirli bir nanopartikül konsantrasyonu olduğunu belirtmektedir. Yüksek nanopartikülkonsantrasyonu, esas olarak dinamik viskozitedeki artış ve partikül topaklanma olasılığı nedeniyle dahayüksek ısıl dirence yol açmaktadır. Nanoakışkan kullanımı ile ısı borularının ısı transfer performansındakiartışın, gelişmiş Brownian hareketi, geliştirilmiş yüzey ıslanabilirliği, artan çekirdeklenme bölgeleri venanoakışkanların yüksek ısıl iletkenliğinden kaynaklanmaktadır.

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“…Electric and electronic devices such as motors, generators, power controllers, and battery systems, among others, require complicated thermal management solutions since high heat flux dissipation rates and homogeneous temperature distributions are indispensable. Large heat flux dissipation rates in regards to electric applications are often realized by immersion cooling [1,2], heat pipes [3,4], or impingement cooling [5][6][7][8][9][10]. Immersion cooling, where the components are immersed in a cooling fluid, is not the most weightefficient way of cooling and mainly suitable for stationary devices such as transformers, generators, motors, battery and server applications (electric, electronic, or IT components), and, e.g., steel treatment (steel industry).…”

Section: Introductionmentioning

confidence: 99%

“…Heat pipes find their application in very compact units (e.g., laptops, CPUs, etc. ), where limited space is available and a demand for high heat flux dissipation is required [3,4], especially for the minimization of hot spots. Jet or spray impingement cooling is based on jet/small atomized droplets impacting the hot surface, forming a liquid film and leading to high heat dissipation flux.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Fluorescence Tracers for Thermometry and Film Thickness Measurements in Liquid Coolants Relevant for Thermal Management of Electric and Electronic Components

Koegl

Delwig

Zigan

2022

Sensors

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This study investigated a novel two-color LIF (laser-induced fluorescence) technique for thermometry in coolants relevant for electric components. In principle, this diagnostic enables thermometry in liquid flows but also a simultaneous determination of film thickness and film temperature, which is relevant, e.g., for jet impingement cooled electric components. Temperature measurements are based on a temperature-sensitive intensity ratio of special tracers realized by suitable band pass filters within the respective emission spectra. For this purpose, the heat transfer fluids Fragoltherm F12, Marlotherm LH, and a water–glycol mixture WG20 (80 vol.% water, 20 vol.% glycol) and its individual components were doped with suitable tracers. The tracer Eosin-Y was utilized for polar coolants (water, WG20, and glycol) and Nile red was utilized for non-polar solvents (Fragoltherm F12 and Marlotherm LH). The spectral LIF intensities were recorded for a wide range of temperatures (253–393 K), which are relevant for cooling of electric motors, batteries, and power electronics. Furthermore, absorption spectra were analyzed as well. The temperature-dependent fluorescence measurements revealed different behavior for the polar and non-polar solvents. A temperature increase in the polar solvents (water, WG20, glycol) led to a spectral shift of the emission peaks of Eosin-Y towards longer wavelengths (red-shifted), while the peaks of Nile red in the non-polar solvents (Fragoltherm F12 and Marlotherm LH) showed an opposite behavior and were blue-shifted. The highest average temperature sensitivity was achieved for Marlotherm LH (4.22%/K), followed by glycol (1.99%/K), WG20 (1.80%/K), water (1.62%/K), and Fragoltherm F12 (1.12%/K). These sensitivities are similar to or even much higher than the literature data of other LIF tracers, which were, however, not determined in those coolants. Consequently, the two novel proposed dyes for the studied heat transfer liquids enable a reliable temperature determination.

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A descriptive review of the thermal transport mechanisms in mono and hybrid nanofluid-filled heat pipes and current developments

Cited by 15 publications

References 74 publications

A Review of Working Fluids and Flow State Effects on Thermal Performance of Micro-Channel Oscillating Heat Pipe for Aerospace Heat Dissipation

A Review of Working Fluids and Flow State Effects on Thermal Performance of Micro-Channel Oscillating Heat Pipe for Aerospace Heat Dissipation

Isı Borularında Nanoakışkan Uygulamaları

Characterization of Fluorescence Tracers for Thermometry and Film Thickness Measurements in Liquid Coolants Relevant for Thermal Management of Electric and Electronic Components

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