Enhancement of the pool boiling heat transfer coefficient using the gas injection into the water

Sarafraz, M.M.; Peyghambarzadeh, S.M.; Fazel, Seyed Ali Alavi

doi:10.2478/v10026-012-0110-5

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…Accordingly, the researchers O'Connor et al [54] and You et al [55] arrived at similar conclusions and highlighted that the boiling incipience for the FC-72 refrigerant was sensitive to the dissolved inert gas at concentrations superior to 0.005 mol/mole. In the experimental work carried out by the authors Sarafraz et al [56], the effects of SO 2 gas injection on the water nucleate pool boiling heat transfer performance were studied. In this direction, the effects of different operating parameters, including the mole fractions of SO 2 dissolved in water and different imposed heat fluxes up to 114 kW/m 2 , on the nucleate pool boiling HTC, nucleation site density, and bubble departure diameter were experimentally examined.…”

Section: Gas Injectionmentioning

confidence: 99%

An Overview of the Recent Advances in Pool Boiling Enhancement Materials, Structrure, and Devices

Pereira,

Souza,

Lima

et al. 2024

Micromachines

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This review attempts to provide a comprehensive assessment of recent methodologies, structures, and devices for pool boiling heat transfer enhancement. Several enhancement approaches relating to the underlying fluid route and the capability to eliminate incipient boiling hysteresis, augment the nucleate boiling heat transfer coefficient, and improve the critical heat flux are assessed. Hence, this study addresses the most relevant issues related to active and passive enhancement techniques and compound enhancement schemes. Passive heat transfer enhancement techniques encompass multiscale surface modification of the heating surface, such as modification with nanoparticles, tunnels, grooves, porous coatings, and enhanced nanostructured surfaces. Also, there are already studies on the employment of a wide range of passive enhancement techniques, like displaced enhancement, swirl flow aids, and bi-thermally conductive surfaces. Moreover, the combined usage of two or more enhancement techniques, commonly known as compound enhancement approaches, is also addressed in this survey. Additionally, the present work highlights the existing scarcity of sufficiently large available databases for a given enhancement methodology regarding the influencing factors derived from the implementation of innovative thermal management systems for temperature-sensitive electronic and power devices, for instance, material, morphology, relative positioning and orientation of the boiling surface, and nucleate boiling heat transfer enhancement pattern and scale. Such scarcity means the available findings are not totally accurate and suitable for the design and implementation of new thermal management systems. The analysis of more than 100 studies in this field shows that all such improvement methodologies aim to enhance the nucleate boiling heat transfer parameters of the critical heat flux and nucleate heat transfer coefficient in pool boiling scenarios. Finally, diverse challenges and prospects for further studies are also pointed out, aimed at developing important in-depth knowledge of the underlying enhancement mechanisms of such techniques.

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Section: Gas Injectionmentioning

confidence: 99%

An Overview of the Recent Advances in Pool Boiling Enhancement Materials, Structrure, and Devices

Pereira,

Souza,

Lima

et al. 2024

Micromachines

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“…This thickness not only enhances the thermal resistance on the surface but also changes the surface characteristics, which decreases the thermal properties of the surface. Also, rate of evaporation of base fluid is another important parameter, which influences the rate of deposition of particles [39][40][41][42][43][44][45][46][47][48] and needs further investigation, which is out of scope of this articles. Also, deposition of Ag nanoparticles may have significant influences on cancer treatment and drug delivery systems, which needs to be investigated [52][53][54][55][56] .…”

Section: Fig 6 Experimental Viscosity Of Nanofluid At Different Tempmentioning

confidence: 99%

Thermal Performance and Viscosity of Biologically Produced Silver/Coconut Oil Nanofluids

Sarafraz¹

2017

Chem.Biochem.Eng.Q.

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In this work, thermal conductivity, viscosity, and boiling heat transfer coefficient of a biologically produced nano-coolant were experimentally quantified. The nanoparticles were produced from silver nitrate via the plant extraction method and by means of green tea leaf extract. The mean size of the particles was 50 nm, with spherical morphology and single-phase structure of Ag (silver). The synthesized particles were dispersed in coconut oil as base fluid. Thermal conductivity and viscosity of the nanofluid were experimentally measured and correlated based on temperature and concentration of nanoparticles via the regression analysis. Thermal performance of the nanofluid inside an annular heat exchanger with convective boiling conditions (in forced convection and nucleate boiling heat transfer regimes) was assessed. The results demonstrated a superior thermal performance in both heat transfer regions over the base oil, and revealed that this nanofluid can be used as a coolant as well as a lubricant in engines with high heat flux conditions, as its thermal conductivity and viscosity were enhanced due to the presence of Ag particles inside the oil.

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“…They observed an increase in thermal conductivity of nanoparticle suspension with increasing nanoparticle volume fraction and fluid temperature. The effect of ethanol/MEG/DEG Ternary mixture suspension on nucleate pool boiling heat transfer characteristics were studied by Sarafraz et al [38] and observed significant changes in thermo physical properties. They summarized the factors affecting the thermal conductivity of nanoparticle suspensions which are properties of particles and the base fluid, nanoparticle volumetric concentration, particle size and temperature.…”

Section: Introductionmentioning

confidence: 99%

Studies on thermophysical property variations of graphene nanoparticle suspended ethylene glycol/water

Periasamy¹,

Ramesh²

2021

CI&CEQ

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The objective of the study is to determine the thermo physical property variations (such as viscosity, density, specific heat capacity and thermal conductivity) of graphene suspended base fluid (Ethylene Glycol (EG) /Water (W)), with respect to graphene nanoparticle concentration and hot fluid inlet temperature. Graphene nanoparticle concentrations (0.2, 0.4, 0.6, 0.8 and 1 volume %) and the base fluid of 30:70 volume % of EG: Water is prepared initially. The impact of graphene nano particle addition on base fluids based on experimentation in the commercial plate heat exchanger was studied. In this experiment, the hot fluid inlet temperature was varied at 55? C, 65? C and 75? C. The experimental results of thermo physical properties were compared with the selected models proposed in the literature. Einstein (1956); Kitano (1981); and Bachelor models (1977) have been used to consider the effect of viscosity. The measured density and Specific heat capacity was validated with Pak and Cho and Xuan model respectively. To consider the effect of thermal conductivity, three different models (Maxwell, 1954; Vajjah, 2010; and Sahoo, 2012) have been used. Study revealed that the thermo physical properties of base fluid significantly affects with the graphene nanoparticle suspension.

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Enhancement of the pool boiling heat transfer coefficient using the gas injection into the water

Cited by 7 publications

References 21 publications

An Overview of the Recent Advances in Pool Boiling Enhancement Materials, Structrure, and Devices

An Overview of the Recent Advances in Pool Boiling Enhancement Materials, Structrure, and Devices

Thermal Performance and Viscosity of Biologically Produced Silver/Coconut Oil Nanofluids

Studies on thermophysical property variations of graphene nanoparticle suspended ethylene glycol/water

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