Single-phase heat transfer regimes in forced flow conditions under exponential heat inputs

Chavagnat, Florian; Nop, R.; Dorville, Nicolas; Phillips, Brent; Bucci, Matteo

doi:10.1016/j.ijheatmasstransfer.2021.121294

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…Single phase heat transfer is realized in the subcooled water and results from the cumulative actions of the turbulent convection processes and the transient heat conduction. Further information on this regime may be found in the recent work of Chavagnat et al [23]. Nevertheless, the heat flux to water is still low at this stage (point 1 in Figure 1).…”

Section: Single-phase Regimementioning

confidence: 64%

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An energy model for the transient flow boiling crisis under highly subcooled conditions at atmospheric pressure

Nop

Duluc

Dorville

et al. 2021

International Journal of Thermal Sciences

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Section: Single-phase Regimementioning

confidence: 64%

“…The fit with the experimental data gives δ ++ ∞ equals 180 for the current set of conditions. However, this quantity is expected to depend on other parameters such as the pressure or the quantity λ defined in Equation (23). The quantity λ represents the ratio at steady-state between heat removal in the x and the y directions.…”

Section: Discussionmentioning

confidence: 99%

An energy model for the transient flow boiling crisis under highly subcooled conditions at atmospheric pressure

Nop

Duluc

Dorville

et al. 2021

International Journal of Thermal Sciences

Self Cite

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“…Li et al (2017) conducted experiments to elucidate transient heat transfer of FC-72 in small diameter tubes and derived an empirical correlation of transient turbulent heat transfer. Chavagnat et al (2021) presented an experimental and theoretical investigation of single-phase forced convection transient heat transfer with water under exponentially escalating heat inputs. They developed an analytical model that can predict well of their database.…”

Section: Introductionmentioning

confidence: 99%

Transient heat transfer of helium gas for forced convective flow through a narrow tube with different lengths

SUZUO,

LIU,

SHIBAHARA

2024

Mechanical Engineering Journal

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The understanding of the heat transfer process for helium gas cooling in the fusion blanket is important for the development of fusion reactors. This research aims at clarifying the transient heat transfer characteristics of helium gas for turbulent flow in a narrow tube. A circular platinum tube with an inner diameter of 1.8 mm was heated by exponentially increasing heat inputs and cooled by helium gas. The lengths of the tube were 30 mm and 50 mm. The heat transfer coefficients gradually increased for the e-folding time shorter than about 1.5 s. This shows that the heat transfer process is in a transient state for this region. The heat transfer coefficients increased with the increase of flow velocity, and the effect of the flow velocity became weak in the transient state region. By comparing with the experimental results of tube with different lengths, it was obtained that the quasi-steady state heat transfer coefficients for the length of 30 mm were higher than those for the lengths of 50 mm and 90 mm. However, the heated length showed a weak influence for the lengths of 30 mm and 50 mm in the transient heat transfer with a relatively smaller e-folding time. The variation of transient Nusselt number with Fourier number at different Reynolds number describes well the trend for the variation of heat transfer coefficient with e-folding time at different velocities. Based on the experimental data, an empirical correlation was obtained for transient heat transfer at different lengths by using Fourier number.

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Design of separate-effects In-Pile transient boiling experiments at the TREAT Facility

Folsom

Armstrong

Woolstenhulme

et al. 2022

Nuclear Engineering and Design

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Single-phase heat transfer regimes in forced flow conditions under exponential heat inputs

Cited by 4 publications

References 8 publications

An energy model for the transient flow boiling crisis under highly subcooled conditions at atmospheric pressure

An energy model for the transient flow boiling crisis under highly subcooled conditions at atmospheric pressure

Transient heat transfer of helium gas for forced convective flow through a narrow tube with different lengths

Design of separate-effects In-Pile transient boiling experiments at the TREAT Facility

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