A mathematic model considering the effect of Brownian motion for subcooled nucleate pool boiling of dilute nanofluids

Li, K.; Li, Xiangdong; Tu, Jiyuan; Wang, Haigang

doi:10.1016/j.ijheatmasstransfer.2015.01.009

Cited by 17 publications

(3 citation statements)

References 27 publications

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“…The authors also proved that rotational movements and translational movements enhance the heat transfer by comparing rotational Reynolds number Re w and translational Reynolds number Re u . Some studies supported the idea that the enhanced thermal behavior of nanofluids is due to Brownian motion [61][62][63], while some other researchers concluded that the Brownian motion has a less significant effect [59,[64][65][66].…”

Section: Heat Transfer Mechanismmentioning

confidence: 91%

Review on Synthesis, Thermo-Physical Property, and Heat Transfer Mechanism of Nanofluids

Patil

Seo²,

Kang

et al. 2016

Energies

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Nanofluids are suspended nano-sized particles in a base fluid. With increasing demand for more high efficiency thermal systems, nanofluids seem to be a promising option for researchers. As a result, numerous investigations have been undertaken to understand the behaviors of nanofluids. Since their discovery, the thermo-physical properties of nanofluids have been under intense research. Inadequate understanding of the mechanisms involved in the heat transfer of nanofluids has been the major obstacle for the development of sophisticated nanofluids with the desired properties. In this comprehensive review paper, investigations on synthesis, thermo-physical properties, and heat transfer mechanisms of nanofluids have been reviewed and presented. Results show that the thermal conductivity of nanofluids increases with the increase of the operating temperature. This can potentially be used for the efficiency enhancement of thermal systems under higher operating temperatures. In addition, this paper also provides details concerning dependency of the thermo-physical properties as well as synthesis and the heat transfer mechanism of the nanofluids.

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Section: Heat Transfer Mechanismmentioning

confidence: 91%

Review on Synthesis, Thermo-Physical Property, and Heat Transfer Mechanism of Nanofluids

Patil

Seo²,

Kang

et al. 2016

Energies

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“…The nanoparticle suspension in nano uids is another important mechanism for enhancing pool boiling heat transfer coe cient (HTC) and CHF under earth gravity. The Brownian motion of nanoparticles in the liquid microlayer near the active cites of the heated surface strengthens the HTC [10,11,13] and CHF [14].…”

Section: Introductionmentioning

confidence: 91%

Experimental Investigation of Critical Heat Flux of Nucleate Pool Boiling of Water and Nanofluid on Platinum Wire Under Hypergravity and Earth Gravity

Chen,

Li,

Fang

et al. 2023

Microgravity Sci. Technol.

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The experimental investigation of the critical heat ux (CHF) of saturated nucleate pool boiling of pure water and water-based Al 2 O 3 nano uids on the platinum wire with a diameter of 50 µm was conducted under earth gravity and hypergravity. The gravity level ranges from 1 to 3 g, the saturation pressures range from 0.1 to 0.6 MPa, and the Al 2 O 3 concentrations in the nano uids ranges from 0.001wt% to 0.015wt%. The experimental results show that both pressure and gravity are vital factors enhancing the CHF, with the effect of pressure more pronounced. The mechanisms of CHF enhancement due to pressure increasing is that increasing pressure changes the uid properties, yielding the synthetical results of activating more nucleate sites and increasing the bubble departure frequency. The reasons for the CHF enhancement by hypergravity may mainly be that the buoyancy force increases with increasing gravity levels, which makes the bubbles more likely to be removed from the surface, and that the formation of large vapor patches covering the heating wire gets harder. Besides, a nano uid has a stronger enhancement to the pool boiling CHF than the combination of the heating surface coated with the same kind of nanoparticles and the base uid. The reason may be that the latter mainly relies on the heater surface modi cation, while the former relies on the nanoparticle suspension in the nano uid and the interaction between the nanoparticle deposition and the nanoparticle suspension, plus the heater surface modi cation.

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“…Li et al [49] used rectangular-shaped cells in a 2D computational domain to carry out an analytical study regarding nucleate boiling heat transfer. The experimental results obtained were significantly aligned with the numerical two-fluid model.…”

Section: Analytical and Numerical Workmentioning

confidence: 99%

A Review on Pool and Flow Boiling Enhancement Using Nanofluids: Nuclear Reactor Application

et al. 2022

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Plasma-facing components (PFCs) are used as the barrier to the beam of high heat flux generated due to nuclear fusion. Therefore, efficient cooling of PFCs is required for safety and smooth operation of a fusion reactor. The Hyper Vapotron (HV) is generally used as the heat exchanger to cool down the PFCs during operation. These heat exchangers use pool and flow boiling mechanisms, and hence, their ability is inherently constrained by critical heat flux (CHF). The boiling of nanofluid is very promising as the working fluid in the HV. The efficiency of the HV increases due to the increase in CHF by applying nanofluids. However, the feasibility of nanofluid cooling in fusion reactors needs proper understanding. This paper reviews the recent developments in the utilization of boiling phenomena in nanofluid as a coolant in the HV. Experiments, theoretical studies, significant achievements, and challenges are analyzed and discussed. Finally, important points are indicated for future research.

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A mathematic model considering the effect of Brownian motion for subcooled nucleate pool boiling of dilute nanofluids

Cited by 17 publications

References 27 publications

Review on Synthesis, Thermo-Physical Property, and Heat Transfer Mechanism of Nanofluids

Review on Synthesis, Thermo-Physical Property, and Heat Transfer Mechanism of Nanofluids

Experimental Investigation of Critical Heat Flux of Nucleate Pool Boiling of Water and Nanofluid on Platinum Wire Under Hypergravity and Earth Gravity

A Review on Pool and Flow Boiling Enhancement Using Nanofluids: Nuclear Reactor Application

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