Transient heat transfer for helium gas flowing over a horizontal cylinder in a narrow channel

Liu, Qiusheng; Wang, Li; Mitsuishi, Akihiro; Shibahara, Masakazu; Fukuda, Katsuya

doi:10.1080/08916152.2017.1283373

Cited by 10 publications

(4 citation statements)

References 13 publications

(18 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to our early research, it is observed that the transition point of period τ for heat transfer coefficient does not show much dependence on velocity because we have rose up the flow velocity to 150 m/s in a narrow channel (Liu et al, 2017). Besides, the effects of gas pressure, initial gas temperature, initial heat generation rate, and structure of the heating surface on transition point are not obvious according to this research and our wide range experiments (Liu et al, 2008;Liu et al, 2014;Liu et al, 2017). Early research by Chao and Cheema (1967) indicated that the response time of the thermal layer due to a step change in wall flux varies directly as Pr 1/3 with Pr ranged from 0.72 to 100.…”

Section: Response Analysis For Heat Transfer Interface Of Solid and Fluid Areamentioning

confidence: 90%

“…Exponentially increasing heat generation rate was added to the tube, and the transient heat transfer coefficient of the tube was analyzed. In our previous research, Liu et al (2008), Liu et al (2014), andLiu et al (2017) experimentally studied the transient heat transfer process for parallel flow of helium gas over a horizontal cylinder and a flat plate. An exponential increasing heat generation rate was applied for the transient heating condition.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux

Wang

2021

Front. Energy Res.

Self Cite

View full text Add to dashboard Cite

This study was conducted to investigate the transient heat transfer characteristics of a twisted structure. The twisted structure was heated according to exponential function (Q=Q0×exp(t/τ), where Q0 is the initial heat generation rate, W/m3; t is time, s; and τ is the period of heat generation rate). A wide range of τ from 37 ms to 14 s was applied for the experimental study. A platinum plate with five pitches (each was 180° twisted with 20 mm in length) was used in the experiment. Helium gas with inlet temperature of 298 K under 500 kPa was used as the coolant. The heat transfer coefficient is found to increase with the decrease of τ, and the transition point was estimated to be at τ≈1s, which means that, when the increasing ratio of heat generation rate satisfies dQdt≥Q0⋅et, the heat transfer enhancement phenomenon will be observed. The response analysis for transient heat transfer at fluid-solid interface was conducted by applying the concept of penetration depth. It is considered that, when the penetration depth is smaller than the thermal boundary thickness, the heat transfer from the interface (wall surface) to the fluid domain is not fully developed during the disturbance.

show abstract

Section: Response Analysis For Heat Transfer Interface Of Solid and Fluid Areamentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux

Wang

2021

Front. Energy Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…A hot gas duct Figure 5.2 illustrates the second sample problem. This problem is based on a hot gas duct design in a helium engineering demonstration loop (HENDEL) with an intended use for high temperature gas-cooled reactors [41]. The loading condition and material considered here are different from the original design.…”

Section: Sample Problem-2mentioning

confidence: 99%

Draft Rules for Alloy 617 Creep-Fatigue Design Using an EPP+SMT Approach

Barua

Messner

Wang

et al. 2021

View full text Add to dashboard Cite

The report describes an improved new creep-fatigue design method for structural components in high temperature nuclear service. The new method uses an integrated elastic-perfectly plastic (EPP) analysis and Simplified Model Test (SMT) approach that greatly simplifies the design process by avoiding the separate evaluation of creep and fatigue damages and eliminating the requirement of stress classification. The report includes draft design rules, presented in a format compatible with an ASME nuclear Code Case, as well as a commentary on the rules and the validation of the rules using pressurized SMT (p-SMT) test data. Areas of potential improvement have been identified for further evaluation. The report also develops EPP+SMT design charts for Alloy 617 at temperatures between 800°C and 950°C by extrapolating high strain range, short hold test data to low strain range and long hold times, typical for structural components in high temperature nuclear service. The design charts are currently limited to 10,000 cycles to avoid excessive extrapolation outside the test database. More robust alternate extrapolation procedures will be considered in future work. The report includes several verification problems comparing the new EPP+SMT design method with current ASME creep-fatigue design methods. The comparison demonstrates that the EPP+SMT method significantly reduces the over-conservatism in current methods. Finally, the report includes a fully-documented sample problem with multiple load cases detailing the application of proposed EPP+SMT design rules.

show abstract

“…They developed an empirical correlation, which presented the experimental data within ±20%. Liu et al (2014Liu et al ( , 2015Liu et al ( , 2017 experimentally studied transient heat transfer for helium gas flowing over test heater with various shapes which are horizontal plates, twisted plates and cylinders. Shibahara et al (2017) carried out experiments and measured transient heat transfer coefficients for water flowing in a narrow tube.…”

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Transient heat transfer for helium gas flowing over a horizontal cylinder in a narrow channel

Cited by 10 publications

References 13 publications

Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux

Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux

Draft Rules for Alloy 617 Creep-Fatigue Design Using an EPP+SMT Approach

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

Contact Info

Product

Resources

About