Study on shrinkage characteristics of heated falling liquid films

Zhang, Feng; Zhang, Zhibing; Geng, Jiao

doi:10.1002/aic.10610

Cited by 36 publications

(19 citation statements)

References 15 publications

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“…For the water film, lateral surface temperature gradient generated the Marangoni effect that caused the contraction/extension of heated/cooled films [11,12]. In this work, the contraction or extension is also found in the ethanol-water films, glycerol-water films and aqueous Na 2 SO 4 films.…”

Section: Resultsmentioning

confidence: 91%

“…By considering thermal Marangoni effect in the heated falling liquid film, we have derived a shrinkage model that can satisfactorily describe the Marangoni flow of heated water films [11]. In this model, the contracted width of the heated falling film on one side can be expressed as [11]:…”

Section: Shrinkage Model For the Heated Filmsmentioning

confidence: 99%

“…Joo [9,10] discovered that the thermo-capillary instability was dominant due to the absence of gravity-driven flow in the lateral direction, inducing the spontaneous film rupture. Zhang [11,12] also investigated the heated water films, revealing that the heated water films were evidently contracted in the lateral direction by the transverse surface tension gradient. This is quite similar to the non-isothermal spreading of liquid drops on heated (cooled) horizontal plates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of Marangoni effect in non-isothermal falling liquid films of binary mixtures

Zhang

Zhao

et al. 2008

International Journal of Thermal Sciences

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Section: Resultsmentioning

confidence: 91%

Section: Shrinkage Model For the Heated Filmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of Marangoni effect in non-isothermal falling liquid films of binary mixtures

Zhang

Zhao

et al. 2008

International Journal of Thermal Sciences

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“…The film contraction thickened the film along the streamwise direction [11] , enhancing the film heat resistance. And under the interaction of the surface tension gradient in transverse direction and the inertial force of fluid, a convex region was formed in the lateral rim [8,12,13] . Moreover, with the decline of Re, Ma T, R evidently decreases, meanwhile the heated area of falling film of distilled water also apparently reduces.…”

Section: Physical Chemistrymentioning

confidence: 99%

Marangoni effect of cracked liquid film of an aqueous electrolyte flowing over a vertical heated plate

et al. 2007

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An experimental investigation was performed on Marangoni effect of cracked liquid film of aqueousNa 2 SO 4 flowing over a vertical heated plate by using a sensitive infrared imaging technique. The results show that the thermal and solutal Marangoni effects, which result from the non-uniform distributions of surface temperature and concentration of the film, respectively, occur in the streamwise and transverse directions of the film, generating different influences on the film heat transfer. Taking account of the Marangoni number (Ma) and the solution concentration (c 0 ), a correlation of the Nusselt number (Nu) for the cracked liquid film is proposed. aqueous electrolyte, Na 2 SO 4 , Marangoni effect, cracked falling film, infrared imaging technique, heat transferHeat and mass transfers of falling film of aqueous electrolyte solution are popular processes in industrial production. During falling film apparatus runs, the liquid film breakdown is frequent due to the intense fluctuations of its operation conditions, remarkably reducing the efficiencies of the heat and mass transfers, and affecting the normal run of the apparatus [1,2] . At present, the information on the flow characteristics of falling film of aqueous electrolyte is still inadequate, causing the imprecision on the design and operation of falling film apparatus. Therefore, for enhancing the heat and mass transfers of falling film and optimising the design and operation of falling film apparatus, it is of practical significance to specifically understand the flow characteristics of cracked falling film of aqueous electrolyte and their influences on the heat and mass transfers of the film.In the work on falling film of aqueous electrolyte, most of researchers tried to enhance the heat transfer of falling film evaporation by adding different surfactants to create Marangoni effect [3][4][5] or changing the surface structure of falling film wall [6,7] . Whereas the work on the Marangoni effect for the aqueous electrolyte itself in heat and mass transfer processes is scarcely reported.Podgorski [8] and Holland [9] theoretically studied the variation of dry patch formed following the falling film breakdown. In the present work, aqueous Na 2 SO 4 solution, a common electrolyte solution in industrial production, was selected as the working liquid. Using a sensitive infrared imaging technique, a series of experiments were performed for the cracked liquid film of the solution falling down a vertical heated plate to determine the influences of Marangoni effect on the flow and heat transfer of the film. Moreover, the correlation of the intensity of heat transfer of the falling film (Nusselt number (Nu)) was obtained and expected to be used in the design of falling film apparatus.

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“…In practical falling film systems, the uncompleted wetting condition has been reported in many previous researches [10][11][12][13][14]. Zhang et al [15,16] developed a theoretical model to evaluate the water film area, and indicated that the contact angle of water on the working surface was indispensable for calculating the area. Recently, Qi et al [17] developed a theoretical model for calculating film deformation during the liquid desiccant regeneration, and found that small contact angle may benefit the film wetted area.…”

Section: Introductionmentioning

confidence: 98%

Investigation on the liquid contact angle and its influence for liquid desiccant dehumidification system

Jiang

2015

International Journal of Heat and Mass Transfer

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Study on shrinkage characteristics of heated falling liquid films

Cited by 36 publications

References 15 publications

Characterization of Marangoni effect in non-isothermal falling liquid films of binary mixtures

Characterization of Marangoni effect in non-isothermal falling liquid films of binary mixtures

Marangoni effect of cracked liquid film of an aqueous electrolyte flowing over a vertical heated plate

Investigation on the liquid contact angle and its influence for liquid desiccant dehumidification system

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