Experimental study of heat transfer at the transition regime between the natural convection and nucleate boiling: Influence of the heated wall tilt angle on the onset of nucleate boiling (ONB) and natural convection (ONC)

Tadrist, Lounès; Combeau, Hervé; Zamoum, Mohammed; Kessal, Mohand

doi:10.1016/j.ijheatmasstransfer.2020.119388

Cited by 9 publications

(7 citation statements)

References 32 publications

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“…The experimental set up aims to obtain thermodynamic and thermally controlled conditions throughout the boiling process. The experimental setup used is shown in figure 1(a) and its specifications are provided in [4,5]. The test fluid used is FC-72.…”

Section: Experimental Set Up and Protocolmentioning

confidence: 99%

“…Furthermore, to create boiling with varying surface inclination, a specially designed boiling meter is used. Its specificities are given in figure 1(b) and (c), its fabrication and calibration are detailed in [4,5]. To measure the intensity of the heat flux, two heat flux sensors having a sensitivity of 2.82 µV/(W/m 2 ) are placed on both sides.…”

Section: Experimental Set Up and Protocolmentioning

confidence: 99%

“…For obtaining wall temperature, a thermocouple (accuracy = ±0.2 °C) placed just under the top copper layer of each fluxmeter allows the local wall temperature measurement. An artificial nucleation site of an average diameter 200 µm and depth of 150 µm is created on the center of the boiling surface to obtain a single bubble [4,5]. 3 present in the cell [4,5].…”

Section: Experimental Set Up and Protocolmentioning

confidence: 99%

“…Nucleate boiling was observed to begin quickly at ϴ=180° with a superheat of 5 °C, while for ϴ =0°, 25.5 °C of superheat was needed. Later, this study was continued by [5], to investigate the heater orientation effect on the onset of natural convection (ONC) and nucleate boiling (ONB) regime. It was observed that heat flux increased with increasing ϴ for the low superheat nucleate boiling regime and decreased with increasing ϴ approaching 180° for the high superheat nucleate boiling regime.…”

Section: Introductionmentioning

confidence: 99%

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Vapor bubble on a single nucleation site : Temperature and heat flux measurements

Kharkwal,

Zamoum,

Barthés

et al. 2024

J. Phys.: Conf. Ser.

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This work aimed at gaining a detailed understanding of heat transfer when boiling occurs on a heated substrate. More specifically, this work focuses on thermal transfers occurring at wall-fluid interfaces at the transition between natural convection and nucleate boiling regimes in pool boiling experiments. To avoid parasitic effects, the vapor bubble is created at a single artificial nucleation site. The boiling cell is instrumented with sensors for temperature measurement, pressure control, and parietal heat flux measurement. The fluid tested is Fluorinert FC-72. For providing a boiling surface and measuring heat flux, a boiling-meter consisting of a heating resistance, heat flux sensors and two thermocouples is used. This boiling-meter enables heat flux generation, the measurement of both temperature and heat flux, and can be rotated through 360°, enabling the influence of inclination to be studied. The boiling-meter is indented at its center to create a single vapor bubble. Thermal measurements are obtained and studied for different inclination angles between 0° and 180° at the saturation conditions. The results showed the nucleation site’s recurrent pattern of being active and inactive for whatever is the boiling surface inclination. Preliminary results are presented and discussed.

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Section: Experimental Set Up and Protocolmentioning

confidence: 99%

Section: Experimental Set Up and Protocolmentioning

confidence: 99%

Section: Experimental Set Up and Protocolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vapor bubble on a single nucleation site : Temperature and heat flux measurements

Kharkwal,

Zamoum,

Barthés

et al. 2024

J. Phys.: Conf. Ser.

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“…They proved that the heat transfer rate intensifies by means of harmonic horizontal rotation. Tadrist et al (2020) experimentally observed the heat transfer of transition regime when it is considered between natural convection and nucleate boiling. The effect of inclination angle on the start point of nucleate boiling is studied.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of parabolic-trough solar collector using double-population LBM with single-node/curved scheme and experimental evaluation on properties of SiO₂-TiO₂/EG nanofluid

Shariatifard

Malekshah

Akbar

2021

HFF

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Purpose This paper aims to analyze the effect of absorber’s geometry and operating fluid on the thermal and hydrodynamic behaviors of a solar collector. Two different profiles are proposed for the absorber which is wavy and flat. Also, the inner tube of HTF (i.e. heat transfer fluid) is considered as single and double. The solar collector is filled with hybrid nanofluid of SiO2-TiO2/ ethylene glycol (EG) which its thermal conductivity and dynamic viscosity are measured using KD2 Pro and Brookfield LVDV III Ultra; respectively, in the temperature range of 30°C to 80°C and nanoparticle concentration in the range of 1.5% to 3.5%. Design/methodology/approach Among the solar collector, the parabolic-trough solar collector is one of the most efficient models for extracting solar thermal power. A parabolic trough solar collector with two different models of absorbers and included with two models of inner HTF tube is proposed. Findings The corresponding regression equations are derived versus temperature and volume fraction and used in the numerical process. For the numerical process, the thermal lattice Boltzmann method manipulated with a single-node curved scheme is used. Also, in the final step, the second law analysis is carried out in local and volumetric forms. The influential factors are Rayleigh number, the concentration of hybrid nano-powder and the structure of absorber profile. Originality/value The originality of the present work is combining a modern numerical method (i.e. double-population lattice Boltzmann method) with experimental observation on characteristics of SiO2-TiO2/EG nanofluid to analyze the thermal performance of parabolic trough solar collector.

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Experimental investigation of surface finishing technique impact on subcooled flow boiling heat transfer enhancement: sandpapering and sandblasting

et al. 2022

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Experimental study of heat transfer at the transition regime between the natural convection and nucleate boiling: Influence of the heated wall tilt angle on the onset of nucleate boiling (ONB) and natural convection (ONC)

Cited by 9 publications

References 32 publications

Vapor bubble on a single nucleation site : Temperature and heat flux measurements

Vapor bubble on a single nucleation site : Temperature and heat flux measurements

Thermal performance of parabolic-trough solar collector using double-population LBM with single-node/curved scheme and experimental evaluation on properties of SiO₂-TiO₂/EG nanofluid

Experimental investigation of surface finishing technique impact on subcooled flow boiling heat transfer enhancement: sandpapering and sandblasting

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Experimental study of heat transfer at the transition regime between the natural convection and nucleate boiling: Influence of the heated wall tilt angle on the onset of nucleate boiling (ONB) and natural convection (ONC)

Cited by 9 publications

References 32 publications

Vapor bubble on a single nucleation site : Temperature and heat flux measurements

Vapor bubble on a single nucleation site : Temperature and heat flux measurements

Thermal performance of parabolic-trough solar collector using double-population LBM with single-node/curved scheme and experimental evaluation on properties of SiO2-TiO2/EG nanofluid

Experimental investigation of surface finishing technique impact on subcooled flow boiling heat transfer enhancement: sandpapering and sandblasting

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Resources

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Thermal performance of parabolic-trough solar collector using double-population LBM with single-node/curved scheme and experimental evaluation on properties of SiO₂-TiO₂/EG nanofluid