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Journal articles on the topic 'Atural convection in an evaporating liquid'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Chandramohan, Aditya, Susmita Dash, Justin A. Weibel, Xuemei Chen, and Suresh V. Garimella. "Marangoni Convection in Evaporating Organic Liquid Droplets on a Nonwetting Substrate." Langmuir 32, no. 19 (May 4, 2016): 4729–35. http://dx.doi.org/10.1021/acs.langmuir.6b00307.

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2

Lim, Elaine, Yew Mun Hung, and Boon Thong Tan. "A hydrodynamic analysis of thermocapillary convection in evaporating thin liquid films." International Journal of Heat and Mass Transfer 108 (May 2017): 1103–14. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.12.111.

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3

Kanatani, Kentaro. "Effects of convection and diffusion of the vapour in evaporating liquid films." Journal of Fluid Mechanics 732 (August 30, 2013): 128–49. http://dx.doi.org/10.1017/jfm.2013.393.

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AbstractWe propose a novel model of a pure liquid film evaporating into an inert gas, taking into account an effect of convection of the vapour by the evaporation flow of the gas. For the liquid phase, the long-wave approximation is applied to the governing equations. Assuming that fluctuations of the vapour concentration in the gas phase are localized in the vicinity of the liquid–gas interface, we consider only the limit of the mass transport equation at the interface. The diffusion term in the vertical direction of the mass transport equation is modelled by introducing the concentration boundary layer above the liquid film and solving the stationary convection–diffusion equation for the concentration inside the boundary layer. We investigate the linear stability of a flat film based on our model. The effect of vapour diffusion along the interface mitigates the Marangoni effect for short-wavelength disturbances. The local variation of vertical advection is found to be negligible. A critical thickness above which the film is stable exists under the presence of gravity. The effect of fluctuation of mass loss of the liquid induced by horizontal vapour diffusion becomes the primary instability mechanism in a very thin region. The effects of the resistance of phase change and the time derivative of the interface concentration are also examined.

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4

Zhi-Qiang, Zhu, and Liu Qiu-Sheng. "Experimental Investigation of Thermocapillary Convection in a Liquid Layer with Evaporating Interface." Chinese Physics Letters 25, no. 11 (October 30, 2008): 4046–49. http://dx.doi.org/10.1088/0256-307x/25/11/057.

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5

Wang, Tian-Shi, and Wan-Yuan Shi. "Marangoni convection instability in an evaporating droplet deposited on volatile liquid layer." International Journal of Heat and Mass Transfer 171 (June 2021): 121055. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.121055.

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6

Nizovtsev, V. V. "Investigation of natural convection and convection stimulated by local irradiation in a thin layer of evaporating liquid." Journal of Applied Mechanics and Technical Physics 30, no. 1 (1989): 132–39. http://dx.doi.org/10.1007/bf00860717.

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7

Lyulin, Yu V., A. S. Kreta, and O. A. Kabov. "Effect of gas flow velocity on convection in a horizontal evaporating liquid layer." Thermophysics and Aeromechanics 26, no. 1 (January 2019): 133–38. http://dx.doi.org/10.1134/s086986431901013x.

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8

Lim, Elaine, and Yew Mun Hung. "Thermophysical phenomena of working fluids of thermocapillary convection in evaporating thin liquid films." International Communications in Heat and Mass Transfer 66 (August 2015): 203–11. http://dx.doi.org/10.1016/j.icheatmasstransfer.2015.06.006.

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9

Lim, Elaine, and Yew Mun Hung. "Long-wave evolution model of thermocapillary convection in an evaporating thin film of pseudoplastic fluids." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 12 (December 2, 2019): 4764–87. http://dx.doi.org/10.1108/hff-01-2019-0003.

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Purpose By solving a long-wave evolution model numerically for power-law fluids, the authors aim to investigate the hydrodynamic and thermal characteristics of thermocapillary flow in an evaporating thin liquid film of pseudoplastic fluid. Design/methodology/approach The flow reversal attributed to the thermocapillary action is manifestly discernible through the streamline plots. Findings The thermocapillary strength is closely related to the viscosity of the fluid, besides its surface tension. The thermocapillary flow prevails in both Newtonian and pseudoplastic fluids at a large Marangoni number and the thermocapillary effect is more significant in the former. The overestimate in the Newtonian fluid is larger than that in the pseudoplastic fluid, owing to the shear-thinning characteristics of the latter. Originality/value This study provides insights into the essential attributes of the underlying flow characteristics in affecting the thermal behavior of thermocapillary convection in an evaporating thin liquid film of the shear-thinning fluids.

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10

Kreta, Aleksei, and Yuriy Lyulin. "Convection Study by PIV Method Within Horizontal Liquid Layer Evaporating Into Inert Gas Flow." MATEC Web of Conferences 72 (2016): 01053. http://dx.doi.org/10.1051/matecconf/20167201053.

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11

Liu, Rong, and Qiusheng Liu. "Linear stability analysis of convection in two-layer system with an evaporating vapor-liquid interface." Acta Mechanica Sinica 22, no. 2 (April 2006): 109–19. http://dx.doi.org/10.1007/s10409-006-0106-6.

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12

Teodorczyk, Andrzej, and Stanislaw Wójcicki. "The Combustion of a Liquid Fuel Droplet during Forced Convection." Journal of Fire Sciences 12, no. 1 (January 1994): 44–61. http://dx.doi.org/10.1177/073490419401200103.

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A new experimental technique was used to investigate single fuel droplet combustion during forced convection: the burning droplet was freely suspended in the controlled air stream, without any additional support. Based on the photo-records of the burning process, the characteristics of the change of square of droplet diameter with time were made and the actual values of burning constants were determined for four hydrocarbon fuels: ben zene, n-heptane, iso-octane and toluene. The experiments were also carried out under micro-gravity and free convection conditions for the same set of fuels. The investigations have allowed the comparison of the burning mechanism of a single droplet for the three different external conditions and have compared quantitatively the burning constants. On the basis of the color pictures of the droplet burning under forced convection conditions and the temperature and gas concentration measurements within the flame, the mechanism of combus tion of fuel droplet was explained. The physical and mathematical models of the process have been proposed which included the aerodynamics of the droplet located in the high Reynolds number air stream, the energy balance of the evaporating droplet and the chemical reaction in the flow. The models have made it possible to determine the quantitative dependence of the burning con stant of different kinds of fuels on Reynolds number, the flow field parameters and the physical and chemical parameters of the liquid and its close surround ings. The calculated values of the parameters describing the burning pro cess have been compared to the experimental data and to the results reported by other investigators. The model has revealed the importance of the feed back mechanism between physical processes involved during droplet combus tion.

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13

Bankoff, S. G. "1987 Max Jakob Memorial Award Lecture: Dynamics and Stability of Thin Heated Liquid Films." Journal of Heat Transfer 112, no. 3 (August 1, 1990): 538–46. http://dx.doi.org/10.1115/1.2910420.

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This review covers the dynamics and tendency toward rupture of thin evaporating liquid films on a heated surface. Very large heat transfer coefficients can be obtained. The applications include various boiling heat transfer and film cooling devices. A relatively new area for study is heat transfer through ultrathin films, which are less than 100 nm in thickness, and hence subject to van der Waals and other long-range molecular forces. Some recent work employing lubrication theory to obtain an evolution equation for the growth of a surface wave is described. Earlier phenomenological work is briefly discussed, as well as the connection between forced-convection subcooled nucleate boiling and thin-film heat transfer.

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14

Zhu, ZhiQiang, and QiuSheng Liu. "Coupling of thermocapillary convection and evaporation effect in a liquid layer when the evaporating interface is open to air." Chinese Science Bulletin 55, no. 3 (January 2010): 233–38. http://dx.doi.org/10.1007/s11434-009-0693-2.

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15

Bekezhanova, Victoria B. "Solution of a Two-Layer Flow Problem with Inhomogeneous Evaporation at the Thermocapillary Interface." Journal of Siberian Federal University. Mathematics & Physics 14, no. 4 (July 2001): 404–13. http://dx.doi.org/10.17516/1997-1397-2021-14-4-404-413.

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The Ostroumov–Birikh type exact solution of thermodiffusion convection equations is constructed in the frame of mathematical model considering evaporation through the liquid–gas interface and the influence of direct and inverse thermodiffusion effects. It is interpreted as a solution describing steady flow of evaporating liquid driven by co-current gas-vapor flux on a working section of a plane horizontal channel. Functional form of required functions is presented. An algorithm for finding all the constants and parameters contained in the solution is outlined, and their explicit expressions are written. The solution is derived for the case of vapor absorption on the upper wall of the channel which is set with the help of the first kind boundary condition for the function of vapor concentration. Applicability field of the solution is briefly discussed

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16

Boville, Byron A., Philip J. Rasch, James J. Hack, and James R. McCaa. "Representation of Clouds and Precipitation Processes in the Community Atmosphere Model Version 3 (CAM3)." Journal of Climate 19, no. 11 (June 1, 2006): 2184–98. http://dx.doi.org/10.1175/jcli3749.1.

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Abstract The parameterizations of clouds and precipitation processes have been revised considerably in the Community Atmosphere Model version 3 (CAM3) compared to its predecessors, CAM2 and the Community Climate Model version 3 (CCM3). The parameterizations in CAM3 are more realistic in their representation of processes affecting cloud liquid and ice particles and represent the linkages between processes more completely. This paper describes the changes to the representation of clouds in CAM3, including the partitioning of cloud water between liquid and ice phases, the determination of particle sizes and sedimentation rates, the phase and evaporation rate of precipitation, and the calculation of the cloud fraction. Parameterization changes between CCM3 and CAM2 introduced a significant cold bias at the tropical tropopause, resulting in a dry bias for stratospheric water vapor. Tests of the sensitivity of the tropical temperature profile and the tropical tropopause temperature to individual process changes suggested that the radiative balance at the tropopause was altered by improvements in both clouds and relative humidity below. Radiative equilibrium calculations suggested that the cold bias could be removed by improving the representation of subvisible cirrus clouds. These results motivated the complete separation of the representation of liquid and ice cloud particles and an examination of the processes that determine their sources and sinks. As a result of these changes, the tropopause cold bias has been almost eliminated in CAM3. The total cloud condensate variable, used in CAM2, has been separated into cloud liquid and cloud ice variables in CAM3. Both sedimentation and large-scale transport of the condensate variables are now included. Snowfall is computed explicitly and the latent heat of fusion has been included for all freezing and melting processes. Both deep and shallow convection parameterizations now detrain cloud condensate directly into the stratiform clouds instead of evaporating the detrained condensate into the environment. The convective parameterizations are not easily modified to include the latent heat of fusion. Therefore, the determination of the phase of convective precipitation, and of detrained condensate, is added as a separate step. Evaporation is included for sedimenting cloud particles and for all sources of precipitation.

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17

Schilder, Boris, Simon Yu Ching Man, Nobuhide Kasagi, Steffen Hardt, and Peter Stephan. "Flow Visualization and Local Measurement of Forced Convection Heat Transfer in a Microtube." Journal of Heat Transfer 132, no. 3 (January 4, 2010). http://dx.doi.org/10.1115/1.4000046.

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The pressure drop and the convective heat transfer characteristics of ethanol and water in a circular tube with a diameter of 600 μm with and without phase change have been studied experimentally. The test section consists of a glass tube coated with a transparent indium tin oxide heater film. For single-phase liquid flow (including superheated liquid) it was found that the measured Nusselt numbers and friction factors are in good agreement with the theoretical values expected from Poiseuille flow. Subsequently, the boiling heat transfer of ethanol was studied. It was found that boiling with bubble growth in both upstream and downstream directions leaving behind a thin evaporating liquid film on the tube wall is the dominant phase change process. Wavy patterns on the film surface indicate shear forces between vapor and liquid phase during slug flow. Temporary dryout phenomena occur even at a low mean vapor quality due to film rupture as a result of film instabilities. Local Nusselt numbers are calculated for the two-phase flow at different heat fluxes and Reynolds numbers. Compared with single-phase flow the heat transfer is enhanced by a factor of 3–8.

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18

Bekezhanova, Victoria B., and Olga N. Goncharova. "Influence of the Thermophysical Properties of a Liquid Coolant on Characteristics of the 3D Flows with Phase Transition." Journal of Siberian Federal University. Mathematics & Physics, November 2019, 655–62. http://dx.doi.org/10.17516/1997-1397-2019-12-6-655-662.

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Regimes of the joint flows of the evaporating liquid and gas – vapor mixture induced by the action of a longitudinal temperature gradient in a three-dimensional channel of a rectangular cross-section in the terrestrial gravity field are studied in the present paper. The theoretical investigations are carried out on the basis of the partially invariant solution of rank 2 and defect 3 of the Boussinesq approximation of the Navier – Stokes equations. This solution allows one to correctly describe the two-layer flows with evapora- tion/condensation at the thermocapillary interface and to take into account the effects of thermodiffusion and diffusive thermal conductivity in the gas–vapor phase. The exact solution of governing equations are characterized by dependence of the velocity components on the transverse coordinates only. The functions of pressure, temperature and concentration of vapor linearly depend on the longitudinal coordinate and have the summands which are functions on transverse coordinates. The required functions satisfy the set of differential equations, boundary and interface conditions followed from the original three-dimensional problem statement and are found as a result of numerical technique. The presented solution of the evap- orative convection problem is very contensive. It permits to specify the 3D flow regimes with different topology, thermal and concentration characteristics observed in physical experiments. Differences of flows in the ethanol–nitrogen, HFE-7100 – nitrogen and FC-72 – nitrogen systems are studied. Impact of the thermophysical properties of the working liquids on the basic characteristics of the fluid motions (hydro- dynamical structure, temperature distribution, vapor content in the nitrogen, evaporative mass flow rate) is analyzed

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19

Shirazy, Mahmood R. S., and Luc G. Fréchette. "Effect of Meniscus Recession on the Effective Pore Radius and Capillary Pumping of Copper Metal Foams." Journal of Electronic Packaging 136, no. 4 (September 19, 2014). http://dx.doi.org/10.1115/1.4026353.

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An experimental study is performed to characterize the effect of meniscus recession on the effective pore radius and capillary pumping of copper metal foams which are to be used as wicks in heat pipes for electronic cooling. Knowledge of the effective pore radius is critical in defining the capillary pumping of a wicking material but is rarely measured under operating conditions. It is known that the meniscus of a liquid recedes when evaporating from a porous media, which could impact the effective pore radius and therefore the capillary pumping capabilities of the foam. To elucidate this impact, the evaporation rate is measured from foam strips wicking ethanol from a reservoir while applying heat fluxes to the foam. Using thermocouple and IR camera measurements, the measured evaporation rates are corrected to account for different thermal losses, including natural convection, direct thermal conduction to the liquid, and evaporation from the container. An analytical model is then developed to relate the evaporated mass to the maximum capillary pressure (minimum effective pore radius) provided by the foam. It is shown for the first time, that just before the onset of dryout, the recessed meniscus will lead to 15%, 28%, and 52% decrease in effective pore radius for samples with 68%, 75%, and 82% porosities, respectively. The capillary pumping therefore increases during evaporation. This can have significant impact on the prediction of the capillary limits in two phase capillary driven devices.

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