Flow visualization in dilute oxide based nanofluid boiling

Patra, Nirupama; Ghosh, Pradyumna; Singh, Ravi Shankar; Nayak, Arun K.

doi:10.1016/j.ijheatmasstransfer.2019.01.145

Cited by 35 publications

(4 citation statements)

References 55 publications

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“…Similar behaviour was observed by Patra et.al. 40 However, from the experimental observation, it is noticed that bubble size for all the nanofluids is smaller as compared to water. But the bubble detachment frequency for nanofluids is more compared to water.…”

Section: Resultsmentioning

confidence: 88%

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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Section: Resultsmentioning

confidence: 88%

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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“…For nanofluids, it was considered that the zeta potential index is a key role to measure the stability of nanofluid. Zeta potential is the electric potential difference between the dispersion phase (particles) and the stationary layer of base fluid which is in contact with the dispersed particle [87,88].…”

Section: Stability Of Nanofluids During the Boiling Processmentioning

confidence: 99%

Experimental studies of flow boiling heat transfer by using nanofluids

Kamel

Lezsovits

Hussein

2019

J Therm Anal Calorim

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Flow boiling heat transfer widely utilized in numerous industrial applications such as boiler tubes, evaporators and cooling of reactors in a nuclear power plant. Nanofluids are a new category of thermal fluids, made by dispersing a nanometer solid particle which is usually less than 100 nm into conventional liquids such as water, oil engine and ethylene glycol with the intent to enhance the thermal properties of the base fluids. This work reviews the recent experimental studies focusing on the flow boiling heat transfer using nanofluids. The latest results associated with this subject are presented and outlined to account the influence of several parameters, which are related to operating conditions and nanoparticles morphology on the heat transfer coefficient and the critical heat flux. Besides, the effects of nanoparticles on other related sub-phenomenon of the flow boiling by using nanofluids were discussed. Moreover, the latest review papers of the related topic were presented and briefly discussed. Finally, suggestions for future research activities related to this field were also concisely listed.

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“…Ozawa [11] developed the fast-response thin TSP and obtained time sequential temperature images using a high-speed camera at a temporal resolution of 71 µs. In addition, because boiling is a dynamic phenomenon, its visualization requires a measurement system with a high temporal resolution [12][13][14][15]. One of authors [15] investigated an interesting behavior of a jet-ejected boiling droplet near the Leidenfrost temperature.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of thin inorganic temperature-sensitive paint using ball milling and its temporal response delay

Jung,

Saito,

Someya

et al. 2024

Meas. Sci. Technol.

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Temperature-sensitive paint (TSP) is widely used to measure the temperature distribution. A TSP is advantageous in terms of cost and spatiotemporal resolution. However, regardless of its thickness, a finite thickness introduces errors. An important issue regarding the thickness of the TSP is the temporal response delay. In this study, a thin TSP was fabricated using ball milling, and TSPs with a thickness < 2 µm could be produced. However, the phosphorescence intensity decreased drastically after ball milling. A special system was designed to measure the temporal response delay caused by the TSP layer. A high-resolution measurement technique (210 kHz and 1.05 µm/pixel) was employed. Time delays were defined and calculated using both experimental and numerical approaches. Numerical simulations were conducted using the experimental data and the thermal properties of ZnO:Zn and epoxy, given that the thermal properties of TSP are unknown. From the time delay, it was found that the thermal diffusivity of the TSP was between those of ZnO:Zn and epoxy, and this result was considered reasonable. Although this study provides only a rough estimation of the thermal diffusivity of TSPs, it reveals a relationship between the time delay and thermal diffusivity, opening up the possibility of calculating the thermal diffusivity from the time delay. Our results can help advance the application of TSPs for temperature measurements in highly dynamic environments.

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Flow visualization in dilute oxide based nanofluid boiling

Cited by 35 publications

References 55 publications

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

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

Experimental studies of flow boiling heat transfer by using nanofluids

Fabrication of thin inorganic temperature-sensitive paint using ball milling and its temporal response delay

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