A two-phase model for laminar film condensation from steam-air mixtures in vertical parallel-plate channels

Siow, E.C.; Ormiston, S.J.; Soliman, H.M.

doi:10.1007/s00231-003-0425-0

Cited by 35 publications

(34 citation statements)

References 20 publications

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“…They found that at high Reynolds numbers the heat transfer coefficients strongly depend on the interfacial shear stresses. Studies on the condensation of vapor in the presence of non-condensable gas in vertical tube are also available in literature [16][17][18][19][20][21][22][23]. Dehbi and Guentay [16] included the effect of interfacial shear stress on condensation, and they used heat and mass transfer analogy to obtain condensation rates.…”

Section: Introductionmentioning

confidence: 98%

“…They also developed a theoretical model for the annular filmwise condensation with non-condensable gas using heat and mass transfer analogy. Siow et al [22] obtained numerical results for the case of laminar film condensation from steam-air mixtures in a vertical parallel plate channel using a fully-coupled implicit numerical approach. They estimated local and average condensation Nusselt numbers, condensate film thickness and pressure gradient from numerical results for steam-air mixtures over wide ranges of four independent system parameters, such as non-condensable gas concentration, gas phase Reynolds number, pressure gradient, and the difference between the inlet and wall temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Traces of non-condensable gases may enter into the condenser either as gases dissolved in the boiler feed water or due to leakage in the condenser. The effect of the presence of these gases on the process of condensation of vapor inside vertical tubes and channels was studied in literature [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. It is found that the existence of low percentage of non-condensable gas in vapors greatly reduces the heat transfer and the condensation rates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Convective condensation of vapor in the presence of a non-condensable gas of high concentration in laminar flow in a vertical pipe

Rao

Krishna

Sharma

et al. 2008

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Convective condensation of vapor in the presence of a non-condensable gas of high concentration in laminar flow in a vertical pipe

Rao

Krishna

Sharma

et al. 2008

International Journal of Heat and Mass Transfer

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“…There are no papers in the literature dealing with condensation heat transfer in a thermoplate channel. However, many papers are devoted to condensation in conduits having plain walls [18,19] or in vertical tubes [20][21][22]. Nusselt [23] was the first to investigate the condensation heat transfer on the basis of model equations.…”

Section: Brief Literature Reviewmentioning

confidence: 99%

Vapor Condensation Heat Transfer in a Thermoplate Heat Exchanger

Mitrovic

Peterson

2007

Chem Eng & Technol

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The heat transfer and pressure drop in a thermoplate heat exchanger operating as a condenser have been investigated experimentally. In order to separate the heat transfer resistances in the condensation process, the single phase forced convection has been studied using distilled water and Marlotherm oil in the thermoplate and correlations developed for the Nusselt number and the friction factor. For the condensation experiments, an apparatus has been constructed comprising two identical condensers composed of the same thermoplate type as employed in the single phase experiments. Isopropanol is used as a test fluid at pressures below atmospheric pressure. The heat transfer resistances in the condensation experiments are separated and expressions for the condensation heat transfer and pressure drop are developed with the aid of the results obtained in the single phase studies. Scope of the PaperThermoplates were originally conceived as heat transfer devices for the food and paper industry. Since the early stages of their development some twenty years ago, thermoplate heat exchangers comprising ca. 2 · 10 5 m 2 surface area have been installed in various production and energy conversion processes. The worldwide chemical industry has more than 65 · 10 3 m 2 of thermoplate heat exchangers installed and is the largest industry globally, and also has the highest annual growth rate [1].A thermoplate consists of two metallic sheets, which are spot-welded according to an appropriate pattern, and the edges other than the connecting tubes are continuously seamwelded. By applying the hydro-form technique, a channel with a complex geometry is established between the sheets. One fluid is conducted through this channel while the other fluid moves through the channel bounded by two neighboring thermoplates, Fig. 1. Depending on the process conditions, e.g., a specified pressure drop of the external or interior fluid at the required thermal duty, thermoplates are usually assembled in parallel at an appropriate spacing, thus making a heat exchanger. They are encountered in several areas of cooling/heating techniques and process technology, e.g., as condensers or evaporators.Despite the various uses of thermoplate heat exchangers, their thermo-hydrodynamic characteristics still remain widely unknown. No relevant fluid flow and heat transfer investigations have been reported in the literature, either for the interior or exterior fluid. This results in substantial uncertainties regarding the construction and design of the apparatus, which are commonly surmounted in practice at the expense of the original advantages of thermoplates compared to other constructions, e.g., oversizing and higher material usage. In order to mitigate this unsatisfactory situation, experiments on heat transfer and pressure drop in thermoplate apparatus are required. Such experiments should also include the transport processes on the inside and outside fluids.

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“…In the horizontal orientation, Louahlia and Panday [1,2], and Narain and Kizilyalli [3] performed studies of condensation from pure vapours and Siow et al [4] included the effect of a non-condensing gas. In the vertical orientation, Louahlia and Panday [5,6] studied pure vapours and Siow et al [7] studied steam-air mixtures. In the case of the declining (i.e., downward-inclined) orientation, the work of Narain et al [8] was concerned with condensation from pure vapours while Siow et al [9] reported preliminary results for steam-air mixtures.…”

Section: Introductionmentioning

confidence: 99%

Two-phase modelling of laminar film condensation from vapour–gas mixtures in declining parallel-plate channels

Siow

Ormiston

Soliman

2007

International Journal of Thermal Sciences

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A two-phase model for laminar film condensation from steam-air mixtures in vertical parallel-plate channels

Cited by 35 publications

References 20 publications

Convective condensation of vapor in the presence of a non-condensable gas of high concentration in laminar flow in a vertical pipe

Convective condensation of vapor in the presence of a non-condensable gas of high concentration in laminar flow in a vertical pipe

Vapor Condensation Heat Transfer in a Thermoplate Heat Exchanger

Two-phase modelling of laminar film condensation from vapour–gas mixtures in declining parallel-plate channels

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