Experimental Study of Differences in DNB Heat Flux between Upflow and Downflow in Vertical Rectangular Channel

Sudo, Yukio; Miyata, Keiichi; Ikawa, Hiromasa; Kaminaga, Masanori; Ohkawara, Masami

doi:10.1080/18811248.1985.9735705

Cited by 48 publications

(10 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ackerman et al [26] argued that heat transfer deterioration of supercritical fluid may attribute to a similar phenomenon as called as ''pseudo-film boiling''. Lee et al [27] indicated that occurrence of pseudo-film boiling depends on the wall heat flux and the critical heat flux q wc for occurrence of heat transfer deterioration is a function of mass flow rate per unit area G. Based on the study of critical heat flux of water, Sudo et al [28] proposed a relation between critical heat flux q wc and G in the following formation: Table 2 summarizes results of all the cases at varied G and wall heat flux and with or without heat transfer deterioration. ) with a standard derivation of 6%, is presented in the figure.…”

Section: The Critical Heat Fluxmentioning

confidence: 99%

Numerical study of heat transfer deterioration of turbulent supercritical kerosene flow in heated circular tube

Dang

Zhong

Zhang

et al. 2015

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

a b s t r a c tTurbulent flow and convective heat transfer of supercritical kerosene flow in an axisymmetrically heated circular tube with a diameter of 2 mm and at a mass flow rate range of 0.0015-0.015 kg/s and a wall heat flux range of 0.15-2.0 MW/m 2 are numerically studied using Reynolds averaged Navier-Stokes method with a two-layer turbulence model. The thermophysical and transport properties of kerosene are determined by a 10-species surrogate with the Extended Corresponding State method. Mesh dependency is first investigated and numerical results of fuel and wall temperatures are compared with experimental data for validations. The results show that flow properties such as velocity and Reynolds number increase significantly along the axial direction as the fuel temperature rises and kerosene undergoes the state transition from liquid to supercritical state. Deterioration of convective heat transfer is found to occur when the wall heat flux exceeds a critical value and at the same time, the wall temperature approaches the pseudo-critical temperature of kerosene. The present results show that deterioration of heat transfer are attributed to the development of turbulent properties in the near-wall region based on the results of turbulent kinetic energy and turbulence production term. The relation between the critical heat flux (q wc ) for occurrence of heat transfer deterioration and the mass flux (G) is studied and a fitting formula of q wc and G is obtained.

show abstract

Section: The Critical Heat Fluxmentioning

confidence: 99%

Numerical study of heat transfer deterioration of turbulent supercritical kerosene flow in heated circular tube

Dang

Zhong

Zhang

et al. 2015

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

show abstract

“…Sudo et al [14] conducted an experimental study to investigate CHF for upward and downward flows in a narrow rectangular channel under atmospheric pressure. They observed that downward flow boiling CHF occurred in the unstable counter-current flow regime, and their CHF data for the medium mass flux region were well fitted by the condition for saturated liquid at the channel exit.…”

Section: Introductionmentioning

confidence: 99%

The characteristics of premature and stable critical heat flux for downward flow boiling at low pressure in a narrow rectangular channel

Lee

Chae

et al. 2015

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

“…Some of CHF correlations are shown in Table 2. Sudo et al 4) proposed a correlation for saturated flow CHF for vertical upward flow in rectangular channels. The correlation was derived from dimensionless analysis and was extended to negative quality region by including the second term describing the effect of subcooling.…”

Section: Test Sections and Test Loopmentioning

confidence: 99%

“…As typical examples for CHF experiments, Bortoli et al 3) conducted a series of heat transfer experiments in a 150-690 mm heated length rectangular channel with 1.5-2.6 mm gap in rather high pressure conditions (4.1-13.8 MPa). Sudo et al 4) investigated CHF in a 370-750 mm heated length, 2.25-5.0 mm gap channel and proposed CHF correlations for rectangular channels. Mishima et al 5,6) conducted CHF experiments for upward and downward flows in a 360 mm heated length, 1.0-2.4 mm gap rectangular channel.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Study for Thermal-Hydraulic Design of the Solid-Target of Spallation Neutron Source

Tanaka

Hibiki

Saitō

et al. 2001

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

In relation to thermal-hydraulic design of the solid-target system of a spallation neutron source, heat transfer experiments were performed to obtain experimental data systematically on heat transfer coefficient and critical heat flux (CHF) for vertical upward and horizontal flows in thin rectangular channels simulating a coolant channel of the proposed spallation neutron source. Single phase heat transfer coefficients and CHF data for rectangular channels with 1.0 mm gap (L h /D e =50.2) with mass flux of 10-7,500 kg/m 2 ·s, single phase and two phase heat transfer coefficients, onset of nucleate boiling (ONB) and CHF data for 1.5 mm gap (L h /D e =33.9) with mass flux of 10-5,000 kg/m 2 ·s were obtained in the atmospheric pressure with inlet subcooling of 40-80 K. Finally, thermal-hydraulic correlations that could be used for design calculations were proposed based on the obtained data.

show abstract

Experimental Study of Differences in DNB Heat Flux between Upflow and Downflow in Vertical Rectangular Channel

Cited by 48 publications

References 7 publications

Numerical study of heat transfer deterioration of turbulent supercritical kerosene flow in heated circular tube

Numerical study of heat transfer deterioration of turbulent supercritical kerosene flow in heated circular tube

The characteristics of premature and stable critical heat flux for downward flow boiling at low pressure in a narrow rectangular channel

Heat Transfer Study for Thermal-Hydraulic Design of the Solid-Target of Spallation Neutron Source

Contact Info

Product

Resources

About