Delay in DNB for flow boiling of diluted oxide based nanofluids

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

doi:10.1016/j.expthermflusci.2017.08.016

Cited by 16 publications

(4 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, results found that the nanofluid heat transfer coefficient is more significant than that of water base fluid and this enhancement increased with increasing mass and heat fluxes for both conventional fluids and nanofluids. Patra et al [48] investigated experimentally the flow boiling of two types of nanofluids, namely Al 2 O 3 -water and TiO 2 -water, with various concentrations inside a vertical annulus equipped with a concentric cartridge heater. Their results showed that the heat transfer coefficient for Fig.…”

Section: Effect Of Nanofluids On (Htc) and (Chf)mentioning

confidence: 99%

“…Their results showed that the frictional pressure drop increased with nanoparticle concentration, mass flux and vapor quality. Patra et al [48] studied the behavior of bubble dynamics during flow boiling of nanofluid. They used a high-speed camera to visualize the effect of heat flux and concentration of two types of nanoparticles (Al 2 O 3 and TiO 2 ).…”

Section: Effect Of Nanoparticles Suspension On Other Related Flow Boimentioning

confidence: 99%

“…They used ultrasonication homogenizer with a power of 100 W to disperse different concentrations of nanofluids, and the duration was about 1 h. No surfactant or additives was used in their preparation method, and the suspension was checked to be stable for 1 day approximately without any strong agglomeration. Patra et al [48] used two types of nanoparticles (Al 2 O 3 and TiO 2 ) with water to prepare their nanofluids. They applied ultrasonication to disperse the nanoparticles into the water for 4 h in order to enhance and check the stability of the suspension three effective methods adopted to prepare nanofluids which are pH setting, adding surfactant and sonication.…”

Section: Stability Of Nanofluids During the Boiling Processmentioning

confidence: 99%

See 2 more Smart Citations

Experimental studies of flow boiling heat transfer by using nanofluids

Kamel

Lezsovits

Hussein

2019

J Therm Anal Calorim

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of Nanofluids On (Htc) and (Chf)mentioning

confidence: 99%

Section: Effect Of Nanoparticles Suspension On Other Related Flow Boimentioning

confidence: 99%

Section: Stability Of Nanofluids During the Boiling Processmentioning

confidence: 99%

See 1 more Smart Citation

Experimental studies of flow boiling heat transfer by using nanofluids

Kamel

Lezsovits

Hussein

2019

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…Flow boiling process has more applications (such as boiling in microchannels, steam generation in helical coils and in a nuclear reactor core) than pool boiling [40]. However, studying the behaviour of nanofluid pool boiling [41][42][43][44][45][46][47][48][49][50][51] received more interest from research than nanofluid flow boiling [52][53][54][55][56][57][58][59][60][61][62][63]. Mohammed et al, numerically [60] and experimentally [61] studied the flow boiling phenomenon of the nano-binary-fluid (acetone / ZnBr2 based on graphene nanoparticles) in a rectangular tube.…”

Section: Introductionmentioning

confidence: 99%

Multiphase flow and boiling heat transfer modelling of nanofluids in horizontal tubes embedded in a metal foam

Mohammed

Sardari

Giddings

2019

International Journal of Thermal Sciences

View full text Add to dashboard Cite

The aim of this numerical study is to evaluate the boiling process of nanofluid in horizontal tubes in the presence of a metal foam as a porous medium and represent the experimental work of Zhao et al. in a numerical aspect with a different range of dependent variables. High conductive metal foams are employed to increase the rate of heat transfer and enhance the boiling performance in the domain. The two-phase mixture model is used to simulate the characteristics of nanofluid and solve the governing equations in the two-phase flow and boiling heat transfer problem. R134a and ZnO are considered as the base-fluid and nanoparticles, respectively. The characteristics of the metal foam including the porosity and pore density as well as operating conditions including the fluid flow including the velocity, induced heat flux and concentration of nanoparticles on the pressure drop, vapour quality and heat transfer coefficient are examined. The results show the positive effect of the metal foam on the vapour production and overall heat transfer coefficient of the nanofluid in the pipe outlet; however, due to the flow resistance as a result of porous medium addition, a higher pressure drop is achieved. For the heat flux of 19 kW/m 2 and inlet velocity of 0.05m/s, by using a metal foam with the porosity of 70 % and pore density of 20 PPI, the vapour quality, heat transfer coefficient and pressure drop enhances by 7.1%, 9.4% and 82.7%, respectively, compared with the case of without metal foam. However, by using the porosity of 90 %, the vapour quality, heat transfer coefficient and pressure drop enhances by 1.6%, 3.5%, and 7.0%, respectively. Consequently, according to the developed results in this paper, a system with a moderate porosity and high pore density is recommended which is finally determined based on the required vapour production and allowed pressure drop.

show abstract