Numerical analysis of filmwise condensation in a plate fin-and-tube heat exchanger in presence of non-condensable gas

Benelmir, Riad; Mokraoui, Salim; Souayed, Ali

doi:10.1007/s00231-009-0531-8

Cited by 14 publications

(3 citation statements)

References 12 publications

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“…To verify the numerical model in this study, a same physical model as Benelmir et al 43 was built, and the numerical simulation under the same boundary conditions was performed. The numerical results were compared with the experimental data to verify the accuracy and reliability of the model.…”

Section: Resultsmentioning

confidence: 99%

Numerical investigation on heat and mass transfer of slit finned tube heat exchanger with humid flue gas

Li-min

Shao

Tang

et al. 2022

Asia-Pacific J Chem Eng

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Very few studies have been reported on the fundamental mechanism analysis the augmentation of heat and mass transfer for the convection and condensation processes in the slit finned tube heat exchanger under dehumidifying conditions. By developing a 3D numerical model for the condensation of the slit finned tube heat exchanger under dehumidifying conditions, the heat and mass transfer characteristics were investigated under different the geometrical and operational

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Section: Resultsmentioning

confidence: 99%

Numerical investigation on heat and mass transfer of slit finned tube heat exchanger with humid flue gas

Li-min

Shao

Tang

et al. 2022

Asia-Pacific J Chem Eng

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“…Ambrosini et al [7] used the commercial CFD code FLUENT ® for the numerical simulation of condensation of an air-steam mixture on a flat wall in a vertical square channel. Benelmir, Mokraoui and Souayed [8] performed a simulation of water-vapor condensation in the presence of non-condensable gas between two vertical plane plates and in a plate fin-and-tube heat exchanger in a stationary mode using FLUENT software and finally, Mohammad Saraireh [9] used FLUENT CFD method to solve Condensation of water vapor from humid air in compact heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

Study and Redesign of Aircooler System in a 16 MW Steam Turbine Surface Condenser at Neka Power Plant

Ghonoodi¹,

Bandpy²

2021

JPEE

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According to the study of basic Rankin thermal cycle, the steam exhaust pressure of a typical steam turbine toward the condenser, plays a great role in the efficiency and the net output power of the steam turbine, so most surface condensers that are working in thermal power plants are kept at vacuum condition so that the maximum power of thermal cycle can be achieved. The vacuum pressure at condenser leads to the entering of air and Non-condensable gases from turbine gland seals to condenser so that the special air ejection equipment is being used to take apart air from steam and vent it to out of condenser. In this study, a special steam and air separator mechanism in an evacuating system called "Aircooler" at a 16 MW steam turbine condenser is being studied and the Fluent CFD software is utilized to analyze the behavior of steam plus air in a typical aircooler system of 16 MW steam turbine condenser of Neka power plant to find a way to reduce the risk of cooling tube rupture in aircooler ducts. The critical condition which tube rupture happens is determined and it is demonstrated that in hot seasons of year, by increasing the seawater cooling temperature and increasing in turbine steam exhaust pressure and temperature, the risk of tube rupture due to more mixture velocity at the first row of aircooler cooling tubes increases and also the effect of tube plugged condition on the performance of aircooler shows that the risk of other tubes rupture will increase and thus the efficiency of aircooler decreases due to more aircooler exhaust temperature. Finally, two modified plans at aircooler system design will be studied and simulated via Fluent CFD software which leads to reduce the risk of tube rupture. The results show that by modification of aircooler ducts and holes, the mixture air and steam flow velocity to first aircooler cooling tube row decreases significantly and causes the risk of tube rupture to decrease remarkably and also the exhaust temperature of aircooler decreases and causes the higher ejector performance.

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“…Bucci et al [11] used a commercial and an in-house CFD code to evaluate the heat and mass transfer occurring over a flat plate exposed to an air–vapour stream with uniform bulk stream mass fraction and temperature conditions at the wall. Benelmir, Mokraoui and Souayed [12] conducted a numerical analysis of film-wise condensation in a plate fin-and-tube heat exchanger in the presence of non-condensable gas. Moukalled et al [13] used CFD to predict and optimize the performance of an air-conditioning equipment.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of water vapour condensation in the presence of non-condensable gas in vertical cylindrical condensers

2013

International Journal of Heat and Mass Transfer

111

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This paper presents the simulation of the condensation of water vapour in the presence of non-condensable gas using computational fluid dynamics (CFD) for turbulent flows in a vertical cylindrical condenser tube. The simulation accounts for the turbulent flow of the gas mixture, the condenser wall and the turbulent flow of the coolant in the annular channel with no assumptions of constant wall temperature or heat flux. The condensate film is assumed to occupy a negligible volume and its effect on the condensation of the water vapour has been taken into account by imposing a set of boundary conditions. A new strategy is used to overcome the limitation of the currently available commercial CFD package to solve the simultaneous simulation of flows involving multispecies and fluids of gas and liquid in separate channels. The results from the CFD simulations are compared with the experimental results from the literature for the condensation of water vapour with air as the non-condensable gas and for inlet mass fraction of the water vapour from 0.66 to 0.98. The CFD simulation results in general agree well with the directly measured quantities and it is found that the variation of heat flux in the condenser tube is more complex than a simple polynomial curve fit. The CFD results also show that, at least for flows involving high water vapour content, the axial velocity of the gas mixture at the interface between the gas mixture and the condensate film is in general not small and cannot be neglected.

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Numerical analysis of filmwise condensation in a plate fin-and-tube heat exchanger in presence of non-condensable gas

Cited by 14 publications

References 12 publications

Numerical investigation on heat and mass transfer of slit finned tube heat exchanger with humid flue gas

Numerical investigation on heat and mass transfer of slit finned tube heat exchanger with humid flue gas

Study and Redesign of Aircooler System in a 16 MW Steam Turbine Surface Condenser at Neka Power Plant

CFD simulation of water vapour condensation in the presence of non-condensable gas in vertical cylindrical condensers

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