Photographic study on transitions from non-boiling and nucleate boiling regime to film boiling due to increasing heat inputs in liquid nitrogen and water

Sakurai, Akira; Shiotsu, M.; Hata, Kenji; Fukuda, Katsuya

doi:10.1016/s0029-5493(99)00325-8

Cited by 44 publications

(27 citation statements)

References 7 publications

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“…We have supposed before this study that heating rate will affect the incipient boiling superheat and the nucleate boiling heat transfer up to the CHF. Incipient boiling superheat may shift to a high value at a high heating rate, and direct transition to film boiling already observed in liquid nitrogen and water by Sakurai et al (22) may occur in such a case. That may be the cause of very low published data (3), (6), (7) that were about a half or lower of those given by our CHF equation (14) - (16) .…”

Section: Discussionmentioning

confidence: 79%

Influence of Heating Rate on Subcooled Flow Boiling Critical Heat Flux in a Short Vertical Tube

Hata

Shiotsu

Noda

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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The subcooled flow boiling critical heat flux (CHF) for the flow velocities (u = 4.0 to 13.3 m/s), the inlet subcoolings (∆T sub, in = 130 to 161 K), the inlet pressure (P in = 812 to 1 315 kPa), the dissolved oxygen concentration (O 2 = 5.88 and 7.34 ppm) and the increasing heat input (Q 0 exp(t/τ), τ = 38.1 ms to 8.3 s) are systematically measured by the experimental water loop installed the pressurizer. The SUS304 tube of test tube inner diameter (d = 6 mm), heated length (L = 60 mm), L/d = 10 and wall thickness (δ = 0.5 mm) with the rough finished inner surface (Surface roughness, Ra = 3.18 µm) is used in this work. The CHF data for high heating rate were compared with the quasi steady state ones previously obtained and the values calculated by the steady state CHF correlations against outlet and inlet subcoolings. Transient CHF correlation against inlet subcooling has been given based on the experimental data for wide exponentially increasing heat input (Q 0 exp(t/τ), τ = 38.1 ms to 8.3 s). The influence of heating rate on CHF was investigated into details and the dominant mechanism of subcooled flow boiling critical heat flux for high heating rate was discussed.

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Section: Discussionmentioning

confidence: 79%

Influence of Heating Rate on Subcooled Flow Boiling Critical Heat Flux in a Short Vertical Tube

Hata

Shiotsu

Noda

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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“…Later, Duluc et al [2,3] pointed out that the length of the vapor film was a multiple of the Taylor wavelength l T and proposed a model to explain the discontinuous branches in the mixed boiling region and the influence of the thermal inertia of the thin wire heater on transient boiling was also experimentally investigated. Sakurai et al [4] studied the transition from non-boiling regime to film boiling regime in liquid nitrogen on a 1.2-mm-diameter thin wire heater by exponentially increasing heat fluxes, and the explosive-like heterogeneous spontaneous nucleation (HSN) was also confirmed in their investigation.…”

Section: Introductionmentioning

confidence: 91%

Experimental Study of Boiling Phenomena of Liquid Nitrogen Around a Thin Wire Heater in Open Bath and Inside Capillary Tubes

Zhang

Ren

Wang

2006

Nanoscale and Microscale Thermophysical Engineering

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The heat transfer characteristics of liquid nitrogen around a thin wire heater immersed in open bath and confined in glass capillary tubes were experimentally studied in the present article. A thin wire heater of 50 mm in diameter, which was placed in open bath and in the center of the capillary tubes with the diameters of 0.24-3.8 mm, was employed as both the heating element and thermometer. The temperature of the thin wire heater was measured to evaluate the heat transfer performance. The experiments were conducted at the inclination angles from 0 to 90 with an interval of 30 . It was found that the presence of the capillary tube could decrease the superheat of the thin wire heater in the nucleate boiling regime when the diameter of the capillary tube was larger than 0.6 mm. The visualization pictures showed that the boiling appearance in the capillary tube was very different from that in open bath. The inclination angle and the diameter size of the capillary tube have significant effect on the critical heat flux (CHF).

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“…In the present study, the boiling dynamics of HFE-7000 was studied for a step change in heat flux (step response) and pulsed heat inputs (frequency response). Several conventional scale transient pool boiling experiments were conducted using thick metallic blocks [16,[18][19][20] or thin wires [16,[21][22][23][24][25] as the test section. The heat flux was applied in the form of a step change.…”

Section: Introductionmentioning

confidence: 99%

“…The heat flux was applied in the form of a step change. The test fluids were water [25], liquid nitrogen [21,23,26], liquid helium [24], refrigerants like FC72 [19] and R113 [20] or organic fluids like pentane [16,18] and ethyl alcohol [27]. The effects of different parameters such as heat flux, preheating, saturation pressures, test section dimensions, and thermal properties of the fluid and the solid on the temperature response of the system were studied in detail.…”

Section: Introductionmentioning

confidence: 99%

Transient microscale flow boiling heat transfer characteristics of HFE-7000

Basu

Werneke

Peles

et al. 2015

International Journal of Heat and Mass Transfer

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Photographic study on transitions from non-boiling and nucleate boiling regime to film boiling due to increasing heat inputs in liquid nitrogen and water

Cited by 44 publications

References 7 publications

Influence of Heating Rate on Subcooled Flow Boiling Critical Heat Flux in a Short Vertical Tube

Influence of Heating Rate on Subcooled Flow Boiling Critical Heat Flux in a Short Vertical Tube

Experimental Study of Boiling Phenomena of Liquid Nitrogen Around a Thin Wire Heater in Open Bath and Inside Capillary Tubes

Transient microscale flow boiling heat transfer characteristics of HFE-7000

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