The effect of pressure on heat transfer during pool boiling of water-Al2O3 and water-Cu nanofluids on stainless steel smooth tube

Cieśliński, Janusz T.; Kaczmarczyk, Tomasz Z.

doi:10.2478/v10176-011-0026-2

Cited by 9 publications

(6 citation statements)

References 29 publications

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“…Decrease of absolute pressure from about 8 to 4 kPa inside a shell results in distinct heat transfer augmentation. Obtained results confirm tendency observed in the literature [17,37]. Figures 8 and 9 illustrate effect of Al 2 O 3 nanoparticle concentration on TPTHEx overall heat transfer coefficient (OHTC) for absolute pressure inside the shell of 10 kPa and 4 kPa, respectively.…”

Section: Resultssupporting

confidence: 87%

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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Section: Resultssupporting

confidence: 87%

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

Cieśliński

2016

Archives of Thermodynamics

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“…The roughness of the surface boiled in nano-fluid is about twenty five times higher than those of the fresh surface before boiling in nano-fluid. When the size of the particles and the size of the surface roughness are comparable, the particles settle in the voids of the surface and block nucleation sites which lead to heat transfer deterioration Cieslinski and Kaczmarczyk [18]. It is found that the effect of increased surface roughness due to nano-particle layering can be twofold, significantly reducing boiling of the base fluid and slightly decreasing performance for the nano-fluid.…”

Section: Resultsmentioning

confidence: 97%

Pool Boiling Heat Transfer from Aluminum Alloy Circular Surface Using Al2O3 and CuO Water Based Nano-fluids

Fahmy

Aziz

2019

Period. Polytech. Chem. Eng.

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The present work aims to study the effect of nano-particles volume fraction of nano-fluid on the heat transfer during pool boiling with different values of heat flux. The concentration ratios by volume in demineralized water are taken as 0.02 %, 0.20 %, 0.40 %, 0.60, and 0.80 % for Al2O3 nano-particles and 0.02 %, 0.06 %, and 0.20 % for CuO nano-particles. Heat transfer coefficients for pool boiling were established experimentally for different values of volume fraction and heat flux. The heating element is made from an aluminum alloy (AL 6061) with a circular smooth surface of 100 mm diameter and 10 mm thickness. The nano-particles porous layer that builds up during boiling is observed by a scanning electron microscope of the heated surface before and after the boiling. The results demonstrate that the heat transfer rate depends on the concentration ratios and heat flux. Using nano-particles decreases the pool boiling heat transfer in comparison with demineralized water. Due to the deposition of nano-particles on the heated surface, lower heat transfer is obtained for a lower bubble departure compared with demineralized water for the small wall superheat.

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“…In contrast, the higher heat transfer coefficient was recorded for stainless steel tube compared to the copper tube for the same applied heat flux. In another work, Cieśliński and Kaczmarczyk [17] examined the influence of operating pressure 200, 100, and 10 kPa on two types of nanofluids during pool boiling process. Their results revealed that independent of nanoparticle materials (Al 2 O 3 and Cu) and their concentration, while an increase in operating pressure enhanced the heat transfer performance.…”

Section: S Kamel F Lezsovitsmentioning

confidence: 99%

Experimental Study on Pool Boiling Heat Transfer Performance of Magnesium Oxide Nanoparticles Based Water Nanofluid

Kamel

Lezsovits

2020

Pollack

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This study aims to experimentally investigate the nucleate pool boiling heat transfer performance of magnesium oxide nanoparticles MgO based deionized water nanofluid at the atmospheric pressure condition. Dilute volumetric concentrations within a range of 0.001% to 0.01% Vol. were used to examine the pool boiling heat transfer performance represented by pool boiling curve, and pool boiling heat transfer coefficient. The heating element was a horizontal copper heated tube with a typical diameter 22 mm submerged inside the cubic boiling chamber. Efforts have been made to measure the surface temperatures along the heated tube to ensure the proper and accurate heat transfer coefficient calculations in this work. The results indicated that the pool boiling heat transfer coefficient enhancement ratio (PBHTC /PBHTC ) was intensified for volume fractions i.e. 0.001%, 0.004%, and 0.007% Vol. while it was degraded for volume concentrations i.e. 0.01%, and 0.04% Vol. compared to deionized water as baseline case.

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The effect of pressure on heat transfer during pool boiling of water-Al2O3 and water-Cu nanofluids on stainless steel smooth tube

Cited by 9 publications

References 29 publications

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

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

Pool Boiling Heat Transfer from Aluminum Alloy Circular Surface Using Al2O3 and CuO Water Based Nano-fluids

Experimental Study on Pool Boiling Heat Transfer Performance of Magnesium Oxide Nanoparticles Based Water Nanofluid

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