Experimental study on transient heat transfer enhancement from a twisted plate in convection flow of helium gas

Liu, Qiusheng; Zhao, Zhou; Fukuda, Katsuya

doi:10.1016/j.ijheatmasstransfer.2015.07.061

Cited by 8 publications

(5 citation statements)

References 28 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The heat transfer coefficients measured using 1 mm diameter tube for flow velocities of 8, 9, 10 and 11m/s, and inlet temperature of 303 K were plotted with the surface temperature differences of 20, 30, 40 and 50 K. With the increase of exponential periods, the heat transfer coefficients gradually decrease and approach an asymptotic value at each velocity. This trend is similar to observations by other researchers [14][15][16]. As shown In Fig.…”

Section: Transient Heat Transfer Coefficientsupporting

confidence: 93%

“…This can be proven by the fact that the flow velocity has relatively small impact on heat transfer coefficients in the transient state region. Liu [15] stated that the development of thermal boundary layer is slower than the increment of wall temperature due to very high heat generation rate. The heat conduction is high due to thin thermal boundary layer and severe temperature gradients.…”

Section: Transient Heat Transfer Coefficientmentioning

confidence: 99%

“…They derived the transient Nusselt number correlation by introducing one non-dimensional parameter, τu/L (where τ, u and L represent period, velocity and heater length, respectively). Liu et al [12][13][14][15] conducted transient experiments for parallel flow of helium gas over horizontal cylinders, flat plates and twisted plates at various exponential periods of heat generation rates. Transient heat transfer correlations were obtained for various of heater configurations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transient heat transfer due to exponentially increasing heat inputs for turbulent flow of FC-72 in small diameter tubes

Fukuda

Liu

2017

International Journal of Heat and Mass Transfer

Self Cite

View full text Add to dashboard Cite

The transient heat transfer process due to exponentially increasing heat inputs for turbulent flow of FC-72 was schematically investigated for different combinations of parameters such as flow velocity, inlet liquid temperature and period of exponentially increasing heat inputs. The ranges of Reynolds number, Red, and Prandtl number, Pr, were 23,400 to 81,800 and 8.4 to 10.8, respectively. The test heaters used in this study were circular SUS304 tubes with small inner diameters of 1, 1.8 and 2.8 mm, wall thickness of 0.5 mm, and heated lengths around 30, 40 and 50 mm. The effects of flow velocity, exponential period and tube inner diameter on transient turbulent heat transfer process were discussed in detail. It was clarified that the transient turbulent heat transfer due to exponentially increasing heat inputs could be analyzed by introducing a dimensionless time, Fourier number, Fo. An empirical correlation for transient turbulent heat transfer caused by exponentially increasing heat inputs on small diameter tubes was developed based on the effects of Fo, flow velocity and tube inner diameter. The empirical correlation presents the experimental data within ±25%.

show abstract

Section: Transient Heat Transfer Coefficientsupporting

confidence: 93%

Section: Transient Heat Transfer Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Transient heat transfer due to exponentially increasing heat inputs for turbulent flow of FC-72 in small diameter tubes

Fukuda

Liu

2017

International Journal of Heat and Mass Transfer

Self Cite

View full text Add to dashboard Cite

show abstract

“…The experimental facilities contained three main components: a helium gas loop, a heat input control system, and a data acquisition and analysis system. A schematic drawing of the helium gas loop reported by Liu et al [20,21] is illustrated in Fig. 1.…”

Section: Helium Gas Loopmentioning

confidence: 99%

Experimental Study on Forced Convection Heat Transfer of Helium Gas through a Minichannel

Liu

Shibahara

2021

International Journal of Heat and Mass Transfer

Self Cite

View full text Add to dashboard Cite

“…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

Experimental study on transient heat transfer enhancement from a twisted plate in convection flow of helium gas

Cited by 8 publications

References 28 publications

Transient heat transfer due to exponentially increasing heat inputs for turbulent flow of FC-72 in small diameter tubes

Transient heat transfer due to exponentially increasing heat inputs for turbulent flow of FC-72 in small diameter tubes

Experimental Study on Forced Convection Heat Transfer of Helium Gas through a Minichannel

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

Contact Info

Product

Resources

About