The experimental investigation of tube’s diameter and inclination angle in a separate effect PAFS test facility for APR+

Shin, Chang Wook; No, Hee Cheon; Yun, Bong Yo; Jeon, Byong Guk

doi:10.1016/j.ijheatmasstransfer.2015.02.076

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…The steam line from steam generator to the condensation tube inlet is entirely covered by insulation material to prevent heat loss, and the tracer heater is installed to maintain the steam quality in the steam line. Also the steam qualities in each test conditions are checked by measuring the concentration of entrained chemical material in the steam line in front of the condensation tube [9].…”

Section: Experimental Facilitymentioning

confidence: 99%

“…The next step is making condensate steam flow into the SCOP tube by opening the vent valve. The steam pressure is rapidly decreased and the steam flow rate rises right after the vent valve is opened, but as they reach at steady state, changes in pressure and steam flow rate become less steep [9]. In order to keep equilibrium between the rates of condensation inside the tube and vaporization in the steam generator, the water level of the drain tank is maintained by adjusting the opening of vent valve.…”

Section: Experimental Facilitymentioning

confidence: 99%

“…In order to keep equilibrium between the rates of condensation inside the tube and vaporization in the steam generator, the water level of the drain tank is maintained by adjusting the opening of vent valve. During each condensation test, the cooling water temperature in the condensation tank is kept 100°C as boiling condition [9].…”

Section: Experimental Facilitymentioning

confidence: 99%

“…A schematic diagram of the SCOP is shown in Figure 2. The SCOP facility is composed of the same material and scale horizontal U tube of PAFS [8,9]. Dopson and Chato [10] divided the horizontal flow regimes into two groups in horizontal tubes: high void fraction group (α > 0.5) and low void fraction group (α < 0.5).…”

Section: Introductionmentioning

confidence: 99%

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Modeling of high pressure steam condensation in inclined horizontal tubes of PAFS in APR+

Yun

Shin

2015

Journal of Nuclear Science and Technology

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A Single-tube COndensation exPeriment (SCOP) was performed at Korea Advanced Institute of Science and Technology (KAIST) to simulate the condensation phenomena of Passive Auxiliary Feedwater System (PAFS), which is introduced in Advanced Power Reactor Plus. SCOP tests were conducted for two pipes of different diameters [22.6 and 44.8 mm inside diameter] with 8.2 m length and 2.5-4 degrees of the inclined angles of the upper and lower section of each tube. The experiment were performed at 1.5-6.5 MPa of steam pressure and 0.12-0.45 kg/s of steam flow. Based on the Kim and No correlation (KAIST, 2000), we developed a new turbulent-condensation correlation for the turbulent region of the liquid film in the inclined tube. We introduced the factors to account for the different inclined angle effect, different diameter effect. The Nusselt correlation is adopted for condensation near the tube inlet where the laminar region of the liquid film is dominant due to the small amount of condensed water. The present correlation was compared with the Shah and RELAP5 condensation model using the SCOP data. The root mean square errors of the present correlation, Shah model, and RELAP5 model are 17.41%, 57.88%, and 43.07%, respectively: the present correlation can predict well the condensation characteristics in comparison with other correlations in PAFS.

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Section: Experimental Facilitymentioning

confidence: 99%

Section: Experimental Facilitymentioning

confidence: 99%

Section: Experimental Facilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of high pressure steam condensation in inclined horizontal tubes of PAFS in APR+

Yun

Shin

2015

Journal of Nuclear Science and Technology

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“…Besides the studies on condensation and pool boiling, some researchers have worked on the performance of passive heat removal systems numerically [18][19][20] and experimentally [21,22], in which both phenomena take place simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Abadi

Meyer

2018

International Journal of Heat and Mass Transfer

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In this study, the effect of the tube inclination angle on simultaneous condensation inside and pool boiling outside a smooth tube is investigated numerically. Such conjugate phase-change phenomena happen in many heat exchangers, particularly in passive heat removal systems. The simulated domain is a pool filled with water liquid at atmospheric pressure, with a submerged tube with inner and outer diameters of 19 mm and 25 mm respectively. The fluid inside the tube is considered to be the steam at the saturation temperature of 250 °C, which is a very common operating condition in many heat removal systems. The flow field is considered to be turbulent, unsteady and three dimensional. The effect of conduction through the tube thickness is also taken into account. The Eulerian-Eulerian multiphase flow approach is utilized to express the governing equation of the problem. ANSYS FLUENT 17.1 is also used to solve the governing equations. The effects of various parameters, such as tube orientation, steam mass flux and inlet steam quality on the condensation and pool boiling heat transfer coefficients, are investigated. The results show good agreement with the available experimental data. The condensation heat transfer coefficient is found to increase with an increase in the inlet steam quality and steam mass flow rate. The results of the effect of inclination on the heat transfer coefficient are also compatible with the previous experimental works. Moreover, the results show that there is a partial maximum point for the total heat transfer coefficient at an inclination angle between θ = -60° and θ = -30°.

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Experimental study on condensation of high-pressure steam in a horizontal tube with pool boiling outside

Nie

Liu

et al. 2017

International Journal of Heat and Mass Transfer

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The experimental investigation of tube’s diameter and inclination angle in a separate effect PAFS test facility for APR+

Cited by 5 publications

References 6 publications

Modeling of high pressure steam condensation in inclined horizontal tubes of PAFS in APR+

Modeling of high pressure steam condensation in inclined horizontal tubes of PAFS in APR+

Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Experimental study on condensation of high-pressure steam in a horizontal tube with pool boiling outside

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