3D CFD simulations to study the effect of inclination of condenser tube on natural convection and thermal stratification in a passive decay heat removal system

Minocha, Nitin; Joshi, Jyeshtharaj B.; Nayak, Arun K.; Vijayan, P.K.

doi:10.1016/j.nucengdes.2016.06.020

Cited by 16 publications

(7 citation statements)

References 38 publications

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“…For modelling the turbulence the two-equation mixture turbulence model, κ-ɛ, is applied as its suitable performance for the simulation of condensation and boiling in heat removal systems are already approved [28,29]. The equations of turbulence energy and dissipation rate are represented as follows [28,29]:…”

Section: Governing Equationsmentioning

confidence: 99%

“…Where δt denotes the time scale set to 0.05 [28,29]. The correlation of Ranz and Marshall [49] is used for computing the Nu number and corresponding Q at the interface as:…”

Section: Pool Boiling Outside the Tubementioning

confidence: 99%

“…Where Pr is the Prandtl numbers. Moreover the interfacial area concentration, Ainterfacial, can be calculated as follows [28,29]:…”

Section: Pool Boiling Outside the Tubementioning

confidence: 99%

“…Although there are also some numerical works on the performance assessment of passive heat removal systems, none of them considered condensation and pool boiling simultaneously. Minocha et al [28] numerically studied the performance of a passive heat removal system at different tube inclination angles using Open Foam solver. They found that the heat transfer coefficient increased with an increase in the tube inclination angle.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Governing Equationsmentioning

confidence: 99%

“…Where δt denotes the time scale set to 0.05 [28,29]. The correlation of Ranz and Marshall [49] is used for computing the Nu number and corresponding Q at the interface as:…”

Section: Pool Boiling Outside the Tubementioning

confidence: 99%

“…Where Pr is the Prandtl numbers. Moreover the interfacial area concentration, Ainterfacial, can be calculated as follows [28,29]:…”

Section: Pool Boiling Outside the Tubementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Convective heat transfer of molten salt in tubes copper-coated has been employed by shen et al [19] The effects of entropy generation during the turbulent convective heat transfer, for tubes with different characteristics, have been exhibited by Mohseni, et al [14] Numerical and experimental studies in solar thermal absorber tubes with non-uniform heat transfer have been studied by chang, et al [15]. Convection heat transfer for a fixed heat flux has been assayed by Mohammed, et al [13] Convection in simulation in order to study the effect of condenser tube dip, has been utilized by Minocha, et al [16]. Convective heat transfer at the supercritical pressure, on the fluids, has been reviewed by Huange, et al [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Non-uniform Convection on Entropy Generation and Enthalpy for the Laminar Developing Pipe Flow of a High Prandtl Number Fluid

Kakulvand¹

2019

WJAC

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In a boundary wall of a pipe for developed laminar flow, to find the best example in which the least enthalpy and entropy are created, non-uniform distribution of convective flow in wall is studied. Some factors are simulated for transfer coefficient heat variations of moving the pipe. Distribution of temperature, entropy and enthalpy along the radius and distribution of generated entropy and enthalpy along the tube axis are shown. Entropy and enthalpy are reduced along the axis. Entropy, except some areas close to the wall, is increasing along the radius. Temperature and enthalpy, approaching the wall along the radius, have increased.

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Numerical investigation on convective heat transfer in a pool with submerged heat source under seismic condition

Chauhan

Kumar

Chandraker

2023

J Therm Anal Calorim

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3D CFD simulations to study the effect of inclination of condenser tube on natural convection and thermal stratification in a passive decay heat removal system

Cited by 16 publications

References 38 publications

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

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

Effect of Non-uniform Convection on Entropy Generation and Enthalpy for the Laminar Developing Pipe Flow of a High Prandtl Number Fluid

Numerical investigation on convective heat transfer in a pool with submerged heat source under seismic condition

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