A visualization study of flow boiling heat transfer with nanofluids

Rana, K.B.; Rajvanshi, Anil K.; Agrawal, Ghanshyam Das

doi:10.1007/s12650-013-0161-6

Cited by 44 publications

(17 citation statements)

References 14 publications

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“…Experimental data in Figures 5, 6, 7, and 8 shows heat transfer coefficient of 0.0001% ZnO-water nanofluid, 0.001% ZnO-water nanofluid, 0.01% ZnO-water nanofluid, and 0.1% ZnO-water nanofluid. Results show that heat transfer increases with heat flux for all concentrations of ZnO-water nanofluids due to increased energy gain by the nanoparticles, which is in similar trend with previous researches [20]. The increase in heat transfer coefficient was significant at 0.1% volume concentration of nanoparticles because at higher concentration of nanoparticles (0.1%): 120% increased thermal conductivity of ZnO-water nanofluid, 1367% increased surface roughness of heater rod due to deposition of ZnOwater nanofluid, the nanoparticles were deposited more on heater surface thereby increasing the surface area of heater rod and thus increasing the heat transfer by convection also due to increased Brownian motion, particle driven natural convection, and increased conduction between nanoparticles.…”

Section: Resultssupporting

confidence: 89%

“…Rana et al [20] performed experiments in subcooled flow boiling of ZnO-water nanofluids with different low particle concentrations (≤0.01 volume %) in horizontal annulus at heat fluxes from 100 to 450 kW/m 2 and flow rates from 0.1 to 0.175 lps at 1 bar inlet pressure and constant subcooling of 20 ∘ C to determine bubble behavior and heat transfer with flow rates of ZnO. They observed that increase in heat flux leads to increase in bubble diameter; the heat transfer coefficient increases with increase in heat flux and particle volume fraction of ZnO.…”

Section: Introductionmentioning

confidence: 99%

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Flow Boiling Heat Transfer Enhancement by Using ZnO-Water Nanofluids

Prajapati

Rohatgi

2014

Science and Technology of Nuclear Installations

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Nanofluids are liquid suspensions containing nanoparticles that are smaller than 100 nm. There is an increased interest in nanofluids as thermal conductivity of nanofluids is significantly higher than that of the base liquids. ZnO-water nanofluids with volume concentration of ZnO particles varying from 0.0001 to 0.1% were prepared using ultrasonic vibration mixer. Thermal conductivity of the ZnO-water fluids was investigated for different sonication time using thermal property analyzer (KD2 Pro). Thermal conductivity of nanofluids for a given concentration of nanoparticle varies with sonication time. Heat transfer coefficient and pressure drop in an annular test section with variable pressure (1–2.5 bar) and heat flux (0–400 kW/m2) at constant mass flux of 400 kg/m2s were studied for samples having maximum thermal conductivity. Surface roughness of the heating rod was also measured before and after the experimentation. The study shows that heat transfer coefficient increases beyond the base fluid with pressure and concentration of ZnO.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Flow Boiling Heat Transfer Enhancement by Using ZnO-Water Nanofluids

Prajapati

Rohatgi

2014

Science and Technology of Nuclear Installations

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“…Rana et al [63] preformed an experimental visualization study on subcooled flow boiling of ZnO-water nanofluids with different low particle concentrations (≤ 0.01 vol.%) in horizontal annulus. The results showed that heat flux increase lead to the increase in bubble diameter.…”

Section: Recent Studies In Other Parameter Effectmentioning

confidence: 99%

Boiling heat transfer of nanofluids: A review of recent studies

Kamel

Lezsovits

2019

Therm sci

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Adding solid particles of nanometer scale to fluids is one of the most important passive methods of enhancing heat transfer performance. However, this gives numerous chances to investigate new frontiers, but also raises remarkable difficulties. Nanofluids act as suspension that can be obtained by dispersing nanometer-sized nanoparticles (1-100nm) in host fluids with the aim of enhancing thermal properties. This paper is a review of recent studies on boiling heat transfer of nanofluids for pool and convective flow boiling of nanofluids. The research results, collected since 2012 to present of the recent survey are reviewed and briefly outlined. An emphasis is put on the enhancement and the deterioration of the boiling heat transfer coefficient and critical heat flux of pool and convective flow boiling of nanofluids. Other important parameters affecting the boiling of nanofluids are identified and discussed in this review. While preparing future studies is greatly encouraged in order make this phenomenon well understood.

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“…In another experimental study, Rana et al. 27,28 experimentally investigated the flow boiling behaviour of ZnO/water nanofluid with different volume concentrations. The HTC was seen to increase with increasing nanofluid concentration.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Early studies in the open literature mainly focused on HTC, CHF and pressure drop. Some researchers 27,35 focused on the studies related to nanofluid boiling behaviour. They reported that the boiling behaviour of nanofluid is different from water.…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental studies of heat transfer and flow regimes during flow boiling of water and alumina nanofluids at different heat and mass fluxes

Sudheer

Kiran

Balasubramanian

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The flow boiling heat transfer in a vertical pipe of inner diameter 7.5 mm was investigated with pure water and Al2O3/water nanofluid as working fluids. The main heater section was made up of borosilicate glass for better visualization of flow regime. For this study, particle concentrations of 0.001%, 0.005% and 0.01% were considered. The influence of mass flux and heat flux, on flow boiling heat transfer was analysed. From the results, it is observed that boiling heat transfer coefficient is increasing with mass flux for both water and nanofluids. Use of nanofluid decreases wall superheat. The average reduction of wall superheat, as compared to water, at mass flux of 905.42 kg/s-m2 for 0.001%, 0.005% and 0.01% nanofluids is 10.8%, 21.34% and 26.79% respectively. It is also observed that heat transfer coefficient increases with particle concentration due to the changed heater surface characteristics and amendment in bubble formation mechanism. The average enhancement in heat transfer coefficient, as compared to water, for the particle concentrations of 0.001%, 0.005% and 0.01% at a mass flux of 905.42 kg/s-m2 is found to be 12.11%, 21.75% and 27.97%, respectively. Flow visualization study was also done to differentiate flow patterns of water and nanofluids. Churn flow regime was observed for water at moderate heat fluxes. However, in case of nanofluids, churn flow was not observed. The flow boiling heat transfer coefficient is observed to be high for the nanofluids compared to water. An effort has been made to explain the heat transfer mechanism, based on the existing flow boiling regime under the given conditions.

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A visualization study of flow boiling heat transfer with nanofluids

Cited by 44 publications

References 14 publications

Flow Boiling Heat Transfer Enhancement by Using ZnO-Water Nanofluids

Flow Boiling Heat Transfer Enhancement by Using ZnO-Water Nanofluids

Boiling heat transfer of nanofluids: A review of recent studies

Experimental studies of heat transfer and flow regimes during flow boiling of water and alumina nanofluids at different heat and mass fluxes

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