Modeling of film condensation flow in oval microchannels

Ji, Wang; Li, Jun Ming; Hwang, Yunho

doi:10.1016/j.ijheatmasstransfer.2018.05.126

Cited by 17 publications

(3 citation statements)

References 38 publications

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“…2. The selection of pyrolysis reactor type also determines the rate of heat transfer from the heat source to the reactor during the decomposition of scrap tires [26]. The temperature of the pyrolysis process is controlled between 300-350 °C under atmospheric pressure using the fixed bed reactor by considering the ease of the process and results of the condensate oil [23].…”

Section: Methodsmentioning

confidence: 99%

An effect analysis of cooling water direction towards condensate oil from scrap tires

Suyitno

Pane

Libyawati

et al. 2021

EEJET

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The application of pyrolysis for the thermal decomposition of tire waste can be taken as the ideal concept to reduce and recycle tire waste. The product of the process can produce condensate oil, a typical oil that is close to crude oil properties. The critical aspect of the pyrolysis process is the design of the reactor, particularly for the condenser where the rate of heat transfer contributes to the overall quality and quantity of the produced condensate oil. This study focused on the effect of water flow direction on the condensation process of pyrolysis gas. The quantity and quality of the produced oil are examined to observe the effect of the condensation process. Two different water flow directions are tested in the process, namely, counter flow and parallel flow direction. The effect of water flow direction in the condenser clearly affects the pyrolysis process to produce the condensate oil. Based on the production quantity, the counter flow condenser is able to produce 355 ml of condensate oil while the parallel flow one merely 290 ml. Based on the quality of the produced condensate oil, the counter flow condenser is generally better than the parallel flow one where the density, flash point and viscosity are close to crude oil properties. The rate of heat transfer from the condenser to the pyrolysis gas is the main factor that contributes to the quality and quantity of the condensate oil. The average heat transfer for the counter and parallel flow is 2,728 W and 1,865 W, respectively. It can be said that using the counter flow condenser for the pyrolysis reactor can improve the quality and quantity of the condensate oil

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Section: Methodsmentioning

confidence: 99%

An effect analysis of cooling water direction towards condensate oil from scrap tires

Suyitno

Pane

Libyawati

et al. 2021

EEJET

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show abstract

“…Lee et al (2022) presented a computational fluid dynamics (CFD) of the wall film condensation in the presence of non-condensable gases. Wang et al (2018) presented a theoretical model of pure film condensation flow in oval microchannels. They presented the mean heat transfer coefficient and the local heat transfer coefficient along the flow direction.…”

Section: Introductionmentioning

confidence: 99%

Binary liquid film condensation from water-ammonia vapors mixture flowing downward along a parallel plate condenser

Nasr,

Nassif,

Al-Ghamdi

2023

Front. Mech. Eng.

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The ammonia-water film condensation is used as an efficient working fluid in industrial applications such as refrigeration, plate condenser and evaporator, absorber/generator heat exchange, air-conditioning, heat pumps and separation processes. The present work focuses on a numerical investigation of water-ammonia condensation on a falling binary liquid film inside a parallel plate condenser by mixed convection. The parallel plate condenser is composed by two parallel vertical plates. One of the plates is wetted by liquidfilm and cooled by the thermal flux cooling while the other plate is isothermal and dry. Parametric computations were performed to investigate the effects of the inlet parameters of gas, the properties of the binary liquid film as well as the thermal flux cooling on the combined mass and heat transfer and on the efficiency of the parallel plate condenser. The results show that an increase in the inlet vapor of ammonia as well as of vapor water enhances the efficiency of the parallel plate condenser. It is shown also that an enhancement of efficiency of the parallel plate condenser has been recorded when the thermal flux cooling and inlet liquid flow rate is elevated. Whereas the increase of the inlet liquid concentration of ammonia inhibits the efficiency of the parallel plate condenser.

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“…Falling liquid films are widely used in many thermal systems, including falling-film evaporators, scrubbing-cooling chambers, condensers, and nuclear reactors, for the advantages of high heat and mass transfer coefficient, little temperature difference, small flow, and simple structure. As an efficient heat transfer method, falling film systems are usually used under the harsh conditions of high temperature, multiphase flow, and complex interface, which makes that the flow behaviors of falling films so complicated.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics of the Vertical Turbulent Falling Film at High Reynolds Numbers

Wei

Wang

et al. 2020

Ind. Eng. Chem. Res.

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The experimental study on flow characteristics of the turbulent falling film flowing along a vertical Perspex plate was carried out using ultrasonic Doppler velocimetry (UDV, a non-intrusive technique) at 1.85 × 104 ≤ Reynolds number of the liquid film (Rel ) ≤ 3.69 × 104. The instantaneous velocity of the turbulent falling film at different Rel was measured to investigate the velocity distribution, fluctuation range, turbulence intensity, and the flow behavior in falling films. The results showed that the increase of Rel reduced the length of the development region and accelerated turbulent falling films to a steady flow state. There were mainly two reasons for the change of the velocity gradient in films: the amplitude of interfacial waves and the collision of the liquid that has different velocity directions. When the falling films were away from the inlet, the mass transfer within falling films may be dominated by the lateral movement rather than Rel .

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Modeling of film condensation flow in oval microchannels

Cited by 17 publications

References 38 publications

An effect analysis of cooling water direction towards condensate oil from scrap tires

An effect analysis of cooling water direction towards condensate oil from scrap tires

Binary liquid film condensation from water-ammonia vapors mixture flowing downward along a parallel plate condenser

Flow Characteristics of the Vertical Turbulent Falling Film at High Reynolds Numbers

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