Thermal performance of closed two-phase thermosyphon using nanofluids

Khandekar, Sameer; Joshi, Yogesh M.; Mehta, Balkrishna

doi:10.1016/j.ijthermalsci.2007.06.005

Cited by 213 publications

(74 citation statements)

References 26 publications

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“…They typically observed 30 % enhancement for volume 7 % concentration. Khandekar et al (2008) employed various spherical nanoparticle as well as Laponite JS (oblate shape, aspect ratio 1/25) based nanofluids in closed two-phase thermosphere and observed its heat transport behavior to be inferior to that of pure water in all cases.…”

Section: Introductionmentioning

confidence: 99%

The shape effects of nanoparticles suspended in HFE-7100 over wedge with entropy generation and mixed convection

et al. 2015

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The flow of mixed convection nanofluid over wedge under the effects of porous medium is investigated. The HFE-7100 Engineered Fluid having Nimonic 80a metal nanoparticles of spherical and non-spherical shapes with different sizes is used. The particle shape effects on Bejan number and entropy generation are taken into account. The system of partial differential equations is first written in terms of ordinary differential equations using adequate similarity transformations and then solved analytically. Analytical solutions of the resulting equations are obtained for the velocity and temperature profiles. Simultaneous effects of porous medium, particle volume friction, mixed convection parameter, and angle of wedge in the presence of different shapes nanoparticles are demonstrated graphically. Effects of particle concentrations, sizes on wall stress, heat transfer coefficient of Skin friction, and Nusselt are discussed in the form of tables.

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Section: Introductionmentioning

confidence: 99%

The shape effects of nanoparticles suspended in HFE-7100 over wedge with entropy generation and mixed convection

et al. 2015

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“…The operation of a heat pipe is easily understood by using cylindrical geometry. The components of a heat pipe are a sealed container (pipe wall and end caps), a wick structure, and a small amount of working fluid in a liquid state which is in equilibrium with its own vapour [1,2]. The length of the heat pipe is divided into three parts: the evaporator section, the adiabatic section, and the condenser section.…”

Section: Introductionmentioning

confidence: 99%

“…The length of the heat pipe is divided into three parts: the evaporator section, the adiabatic section, and the condenser section. Inevitably, when combinations of these three basic components are selected, a number of conflicting factors may occur [2,3]. The two-phase closed thermosyphon (TPCT) is actually a wickless heat pipe and a gravity-assisted device with a small amount of working fluid, which is in equilibrium with its own vapour, sealed inside a container (pipe wall and end caps) [4].…”

Section: Introductionmentioning

confidence: 99%

Loop Thermosyphon with Vapour Chamber: A Thermodynamic Study

Jengsooksawat

Rittidech

Booddachan

2014

Advances in Mechanical Engineering

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This research presents a case study of the rating heat transfer of a loop thermosyphon with a vapour chamber (LTVC). The dimensions of the evaporator chamber were 200 × 200 × 55, 200 × 200 × 65 and 200 × 200 × 75 mm ( × × ). The adiabatic and condenser section had an 8-loops thermosyphon. The length of the adiabatic and condenser section in each loop was 824 and 800 mm, respectively. The air velocity was 0.5, 1.0, and 1.5 m/s with the heat input being 600, 900, and 1,200 W. The three working fluids were: water, ethanol, and R-11 with filling ratios of 20, 40, and 60% with respect to the chamber volume. The experimental data showed that the LTVC yielded the value of the relative thermal efficiency of about 1 at R-11, a filling ratio of 60%, a velocity of 0.5 m/s, and an aspect ratio of 2.5 in the study conditions. It was further found that the larger vapour chamber was superior in the rating of the heat transfer over other vapour chambers in all experimental conditions in this study.

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“…The carbon nanotubes were treated by a nitric/silfuric acid mixture and the volume concentration of the suspen-sion was 1%. Mehta and Khandekar [14] and Khandekar et al [15] tested STT filled with water-Al 2 O 3 , water-CuO and water-laponite nanofluids. The mass concentration of the nanoparticles was 1%.…”

Section: Introductionmentioning

confidence: 99%

Effect of nanofluid concentration on two-phase thermosyphon heat exchanger performance

Cieśliński

2016

Archives of Thermodynamics

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An approach -relaying on application of nanofluid as a working fluid, to improve performance of the two-phase thermosyphon heat exchanger (TPTHEx) has been proposed. The prototype heat exchanger consists of two horizontal cylindrical vessels connected by two risers and a downcomer. Tube bundles placed in the lower and upper cylinders work as an evaporator and a condenser, respectively. Distilled water and nanofluid water-Al2O3 solution were used as working fluids. Nanoparticles were tested at the concentration of 0.01% and 0.1% by weight. A modified Peclet equation and Wilson method were used to estimate the overall heat transfer coefficient of the tested TPTHEx. The obtained results indicate better performance of the TPTHEx with nanofluids as working fluid compared to distilled water, independent of nanoparticle concentration tested. However, increase in nanoparticle concentration results in overall heat transfer coefficient decrease of the TPTHEx examined. It has been observed that, independent of nanoparticle concentration tested, decrease in operating pressure results in evaporation heat transfer coefficient increase.

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Thermal performance of closed two-phase thermosyphon using nanofluids

Cited by 213 publications

References 26 publications

The shape effects of nanoparticles suspended in HFE-7100 over wedge with entropy generation and mixed convection

The shape effects of nanoparticles suspended in HFE-7100 over wedge with entropy generation and mixed convection

Loop Thermosyphon with Vapour Chamber: A Thermodynamic Study

Effect of nanofluid concentration on two-phase thermosyphon heat exchanger performance

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