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Journal articles on the topic 'Convective mass transfer'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

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1

San, J. Y., W. M. Worek, and Z. Lavan. "Entropy Generation in Convective Heat Transfer and Isothermal Convective Mass Transfer." Journal of Heat Transfer 109, no. 3 (August 1, 1987): 647–52. http://dx.doi.org/10.1115/1.3248137.

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The irreversible generation of entropy for two limiting cases of combined forced-convection heat and mass transfer in a two-dimensional channel are investigated. First, convective heat transfer in a channel with either constant heat flux or constant surface temperature boundary conditions are considered for laminar and turbulent flow. The entropy generation is minimized to yield expressions for optimum plate spacing and optimum Reynolds numbers for both boundary conditions and flow regimes. Second, isothermal convective mass transfer in a channel is considered, assuming the diffusing substance to be an ideal gas with Lewis number equal to unity. The flow is considered to be either laminar or turbulent with boundary conditions at the channel walls of either constant concentration or constant mass flux. The analogy between heat and mass transfer is used to determine the entropy generation and the relations for optimum plate spacing and Reynolds number. The applicable range of the results for both limiting cases are then investigated by non-dimensionalizing the entropy generation equation.

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2

Jaffrin, Michel Y. "Convective Mass Transfer in Hemodialysis." Artificial Organs 19, no. 11 (November 1995): 1162–71. http://dx.doi.org/10.1111/j.1525-1594.1995.tb02277.x.

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3

Kiran, Palle, and S. H. Manjula. "Weakly Nonlinear Double-Diffusive Oscillatory Magneto-Convection Under Gravity Modulation." Sensor Letters 18, no. 9 (September 1, 2020): 725–38. http://dx.doi.org/10.1166/sl.2020.4281.

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An imposed time-periodic gravity field effect on double-diffusive magneto-convection for oscillatory mode has been investigated. The gravity field consisting of steady and periodic modes. A layer is confined with an electrically conducting fluid with Boussines q approximation and heated from below cooled from above. While using the perturbation technique we study nonlinear double-diffusive convection just above the critical state of the onset convection. The growth rate of the disturbances is confined with a critical Rayleigh number to investigate oscillatory convection. Analysis of finite- amplitude convection has been derived through the complex Ginzburg-Landau equation (CGLE). The convective heat and mass transfer obtained through CGLE at third-order under solvability conditions. This convective amplitude is required to estimate heat and mass transfer in terms of the Nusselt and Sherwood numbers. It is found that increasing the frequency of modulation causes diminishing heat and mass transfer. The effect of Prandtl number Pr, magnetic Prandtl number Pm, and amplitude δ enhances heat/mass transfer. It is found that an oscillatory mode of convection enhances the heat and mass transfer than the stationary mode. Further, streamlines, isotherms, and isohalines have their usual nature on double-diffusive magnetoconvection.

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4

RAI, B. N., A. K. SINHA, U. K. GHOSH, S. N. GUPTA, and S. N. UPADHYAY. "FORCED CONVECTIVE MASS TRANSFER IN ANNULI." Chemical Engineering Communications 68, no. 1 (June 1988): 15–30. http://dx.doi.org/10.1080/00986448808940394.

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5

Lenhoff, A. M., and E. N. Lightfoot. "Convective dispersion and interphase mass transfer." Chemical Engineering Science 41, no. 11 (1986): 2795–810. http://dx.doi.org/10.1016/0009-2509(86)80011-2.

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6

Yadav, Dhananjay, Maimouna Al-Siyabi, Mukesh Kumar Awasthi, Salma Al-Nadhairi, Amna Al-Rahbi, Maryam Al-Subhi, Ravi Ragoju, and Krishnendu Bhattacharyya. "Chemical Reaction and Internal Heating Effects on the Double Diffusive Convection in Porous Membrane Enclosures Soaked with Maxwell Fluid." Membranes 12, no. 3 (March 18, 2022): 338. http://dx.doi.org/10.3390/membranes12030338.

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In this paper, the joint impact of the interior heating and chemical reaction on the double diffusive convective flow in porous membrane enclosures soaked by a non-Newtonian Maxwell fluid is investigated applying linear and nonlinear stability techniques. The porous enclosures are square, slender and rectangular. Using the linear stability analysis, the expression for the critical thermal Rayleigh–Darcy number, above which the convective movement occurs, is derived analytically in terms of associated physical parameters. A nonlinear stability examination reliant on the Fourier double series is executed to calculate the convective heat and mass transports of the arrangement. It is observed that the pattern of convective activity is oscillatory only in the occurrence of a relaxation parameter and the threshold value of the relaxation parameter for the occurrence of the oscillatory pattern depends on the other physical parameters. The onset of convective instability accelerates with the increasing chemical reacting parameter, the interior heating parameter, the solute Rayleigh–Darcy number, the Lewis number, the Vadasz number, and the relaxation parameter, while it delays with the heat capacity ratio. The convective heat and mass transfers increase with the solute Rayleigh–Darcy number, the Vadasz number, the relaxation parameter, and the aspect ratio (for rectangular enclosure), while it decreases with the heat capacity ratio and the aspect ratio (for slender enclosure). Additionally, the convective heat transfer enhances with the interior heating parameter, while the convective mass transfer enhances with the chemical reacting parameter and the Lewis number. The effects of Vadasz number, heat capacity ratio, and relaxation parameter are witnessed only on the oscillatory pattern of convection and unsteady convective heat and mass transfers. Further, some existing literature results are compared with the current findings.

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7

Mathuriya, Goldi. "Analysis Effects of Average Value of Convective and Evaporative Heat Transfer Coefficient on Solar Cabinet Dryer for Reduction of Mass of Papad." International Journal for Research in Applied Science and Engineering Technology 9, no. 12 (December 31, 2021): 1511–23. http://dx.doi.org/10.22214/ijraset.2021.39522.

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Abstract: In this research paper, the behavior of heat and mass transfer phenomenon during greenhouse papad drying under forced convection mode has been investigated. Various experiments were performed during the month of April 2020 at SRCEM Banmore, morena (26o 34’13” N 78o 10’48” E). Experimental data obtained for forced convection greenhouse drying of papad were used to determine the constants in the Nusselt number expression by using the simple linear regression analysis and, consequently, the values of convective and evaporative heat transfer coefficients were evaluated. The average values of experimental constants C and n were determined as 0.9714 and 0.0129 respectively. The average values of convective and evaporative heat transfer coefficients were determined as 0.0886 W/m2 oC and 6.7583 W/m2 oC respectively. The experimental error in terms of percentage uncertainty was also evaluated. Keywords: Papad, Papad drying, Heat transfer coefficient, Convective, Evaporative, Forced convection greenhouse

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8

Fu, Wen, Li Zhang, Xiaowei Li, and Xinxin Wu. "Numerical Investigation of Natural Convective Condensation with Noncondensable Gases in the Reactor Containment after Severe Accidents." Science and Technology of Nuclear Installations 2019 (March 3, 2019): 1–12. http://dx.doi.org/10.1155/2019/1673834.

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The heat and mass transfer processes of natural convective condensation with noncondensable gases are very important for the passive containment cooling system of water cooled reactors. Numerical simulation of natural convective condensation with noncondensable gases was realized in the Fluent software by adding condensation models. The scaled AP600 containment condensation experiment was simulated to verify the numerical method. It was shown that the developed method can predict natural convective condensation with noncondensable gases well. The velocity, species, and density fields in the scaled AP600 containment were presented. The heat transfer rate distribution and the influences of the mass fraction of air on heat transfer rate were also analyzed. It is found that the driving force of natural convective condensation with noncondensable gases is mainly caused by the mass fraction difference but not temperature difference. The natural convective condensation with noncondensable gases in AP1000 containment was then simulated. The temperature, species, velocity, and heat flux distributions were obtained and analyzed. The upper head of the containment contributes to 35.1% of the total heat transfer rate, while its area only takes 25.4% of the total condensation area of the containment. The influences of the mass fraction of low molecular weight noncondensable gas (hydrogen) on the natural convective condensation were also discussed based on the detailed species, density, and velocity fields. The results show that addition of hydrogen (production of zirconium-water reaction after severe accident) will weaken the intensity of natural convection and the heat and mass transfer processes significantly. When hydrogen contributes to 50% mole fraction of the noncondensable gases, the heat transfer coefficient will be reduced to 45%.

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9

Kolmychkov, V. V. "COMPUTER SIMULATION FOR SUBCRITICAL CONVECTION IN MULTI‐COMPONENT ALLOYS." Mathematical Modelling and Analysis 11, no. 1 (March 31, 2006): 57–71. http://dx.doi.org/10.3846/13926292.2006.9637302.

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Subcritical convection with hexagonal flow pattern is registered in 3D computer simulation of convective mass transfer in ternary solution under phase transition conditions. The calculations are evaluated by the classical theory of hydrodynamic stability and display a good agreement with linear and finite amplitude stability analysis. Key words: convective instability, subcritical convection, computer simulation.

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10

Barth, Christina, Mohamed Samaha, Hooman Tafreshi, and Mohamed Gad-el-Hak. "Convective Mass Transfer From Submerged Superhydrophobic Surfaces." International Journal of Flow Control 5, no. 2 (June 2013): 79–88. http://dx.doi.org/10.1260/1756-8250.5.2.79.

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11

Yao, Shi-Chune. "Review of "Convective Heat and Mass Transfer"." AIAA Journal 50, no. 5 (May 2012): 1211. http://dx.doi.org/10.2514/1.j051737.

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12

Ma, Pingping, Xianming Li, and David N. Ku. "Convective mass transfer at the carotid bifurcation." Journal of Biomechanics 30, no. 6 (June 1997): 565–71. http://dx.doi.org/10.1016/s0021-9290(97)84506-x.

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13

Stairmand, J. W., and W. S. Haworth. "A novel measurement of convective mass transfer." Chemical Engineering Science 40, no. 6 (1985): 1003–9. http://dx.doi.org/10.1016/0009-2509(85)85014-4.

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14

Telegin, F. Yu. "Convective mass transfer in liquid treatment processes." Journal of the Society of Dyers and Colourists 114, no. 2 (October 22, 2008): 49–55. http://dx.doi.org/10.1111/j.1478-4408.1998.tb01946.x.

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15

Lee, K. W., L. D. Reed, and C. H. Jung. "Convective Mass Transfer onto Multiple Gas Bubbles." Journal of Environmental Engineering 125, no. 7 (July 1999): 634–37. http://dx.doi.org/10.1061/(asce)0733-9372(1999)125:7(634).

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16

Li, Biao, Fu Guo Tong, Chang Liu, and Nian Nian Xi. "Numerical Study on the Surface Convective Heat Transfer of Mass Concrete Structure." Applied Mechanics and Materials 723 (January 2015): 992–95. http://dx.doi.org/10.4028/www.scientific.net/amm.723.992.

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The surface convective heat transfer of mass concrete is an important element of concrete structure temperature effect analysis. Based on coupled Thermal Fluid governing differential equation and finite element method, the paper calculated and analyzed the dependence of the concrete surface convective heat transfer on the air flow velocity and the concrete thermal conductivity coefficient. Results show that the surface convective heat transfer coefficient of concrete is a quadratic polynomial function of the air flow velocity, but influenced much less by the air flow velocity when temperature gradient is dominating in heat transfer. The concrete surface convective heat transfer coefficient increases linearly with the thermal conductivity of concrete increases.

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17

Teng, Ying, Pengfei Wang, Lanlan Jiang, Yu Liu, and Yang Wei. "New Spectrophotometric Method for Quantitative Characterization of Density-Driven Convective Instability." Polymers 13, no. 4 (February 23, 2021): 661. http://dx.doi.org/10.3390/polym13040661.

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CO2 convective dissolution has been regarded as one of the fundamental mechanisms to accelerate the mass transfer of CO2 into brine. We present a new spectrophotometric method to characterize the convective instability and measure the dissolved CO2 mass, which enables the real-time quantitative visualization of CO2/brine transport mechanisms. Successive images were captured to identify the finger development regimes, and the convection morphologies were analyzed by the fingers length and affected area. CO2 solubility was experimentally studied, and the results are in agreement with the theoretical calculations. CO2 mass transfer flux was investigated as the Sherwood number changed. The increase in salinity and temperature has a negative effect on CO2 dissolution; here, numerical simulation and experimental phenomena are qualitatively consistent. In general, these findings confirm the feasibility of the method and improve the understanding of the physical process of CO2 convective dissolution, which can help assess the CO2 solubility trapping mass.

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18

Barreto, Alberto A., Mauri Fortes, Wanyr R. Ferreira, and Luiz C. A. Crespo. "Transport coefficients for low and high-rate mass transfer along a biological horizontal cylinder." Revista Brasileira de Engenharia Agrícola e Ambiental 10, no. 2 (June 2006): 441–47. http://dx.doi.org/10.1590/s1415-43662006000200027.

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Knowledge of heat and mass transfer coefficients is essential for drying simulation studies or design of food and grain thermal processes, including drying. This work presents the full development of a segregated finite element method to solve convection-diffusion problems. The developed scheme allows solving the incompressible, steady-state Navier-Stokes equations and convective-diffusive problems with temperature and moisture dependent properties. The problem of simultaneous energy, momentum and species transfer along an infinite, horizontal cylinder under drying conditions in forced convection is presented, considering conditions normally found in biological material thermal treatment or drying. Numerical results for Nusselt and Sherwood numbers were compared against available empirical expressions; the results agreed within the associated experimental errors. For high rate mass transport processes, the proposed methodology allows to simulate drying conditions involving wall convective mass flux by a simple inclusion of the appropriated boundary conditions.

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19

Alvarado-Juarez, Roberto, Jesús Xaman, Irving Hernandez-Lopez, and Gabriela Alvarez. "Numerical study of laminar and turbulent flow with radiatively participating media." Thermal Science 23, no. 3 Part B (2019): 1825–35. http://dx.doi.org/10.2298/tsci171010309a.

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The effect of radiation of a gray gas in a square cavity with double diffusive natural convection is presented. The regime flow studied range from a thermal Rayleigh number of 104 to 1011 and buoyancy ratio from 0.5 to 2.0. The governing equations of fluid-flow, heat transfer and radiative transfer equation are solved by the finite volume method. The results show the effect of radiatively participating media plays an important role in the heat and mass transfer study doing oblique stratification. The velocity and turbulent viscosity increases about 80% and 22%, respectively, and decreases the convective Nusselt number 13%. The increase of buoyancy ratio increases the mass transfer until 26%. Finally, a practical correlation for computing the convective and radiative Nusselt numbers as well as the Sherwood number is proposed.

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20

Bomba, A., and A. Safonyk. "Identification of mass-transfer coefficient in spatial problem of filtration." Mathematical Modeling and Computing 1, no. 2 (2014): 135–43. http://dx.doi.org/10.23939/mmc2014.02.135.

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A modeling problem of the process of liquid multi component decontamination by a spatial filter is considered, it takes into account the reverse influence of decisive factors (contamination concentrations of liquid and sediment) on characteristics (coefficient of porosity, diffusion) of the medium and gives us the possibility to determine small mass transfer coefficient under the conditions of prevailing of convective constituents over diffusive ones. An algorithm of the solution of the corresponding nonlinear singular disturbed inverse problem of "convection-diffusion mass transfer" type is suggested.

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21

Kaur, Jeevanpreet, Urvashi Gupta, and Ram Prakash Sharma. "Unsteady Finite Amplitude Magneto-Convection of Oldroyd-B Nanofluids with Internal Heat Source." Journal of Nanofluids 12, no. 1 (February 1, 2023): 78–90. http://dx.doi.org/10.1166/jon.2023.1912.

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This work presents a numerical and an analytical review of analysis of the convective phenomenon in a non-Newtonian nanofluid layer with the applied vertical magnetic field and having an internal heating source. Buongiorno model is used to examine the convective instability considering the impacts of thermophoresis, Brownian diffusion, and viscoelasticity of the nanofluid. The effect of significant parameters concerning stability is visualized through graphs and further interpreted. For the non-linear study, the fundamental PDEs are converted into non-linear simultaneous autonomous ODEs. The solutions are computed by taking the help of the software Mathematica. Nusselt number and Sherwood number are graphed for numerous parametric situations to offer a clear outlook of heat and mass transfer rate. The magnetic field parameter stabilizes the system and diminishes heat and mass transfer. Elevating the internal heat parameter promotes heat and mass transfer significantly. Viscoelasticity of the fluid affects prominently since non-Newtonian fluid yields lower heat and mass transfer coefficients than Newtonian fluid due to advancement of the convection.

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22

Kumar, Mahesh, K. S. Kasana, Sudhir Kumar, and Om Prakash. "Experimental study on heat and mass transfer for heating milk." Journal of Energy in Southern Africa 22, no. 3 (August 1, 2011): 45–53. http://dx.doi.org/10.17159/2413-3051/2011/v22i3a3221.

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In this paper, an attempt has been made to estimate the convective heat transfer coefficient for sensible heating of milk in a stainless steel pot during khoa, made by traditional method. Various indoor experiments were performed for simulation of a developed thermal model for maximum evaporation by varying heat inputs from 240 watts to 420 watts. The experimental data was used to determine values of constants in the well known Nusselt expression by simple linear regression analysis and, consequently, convective heat transfer coefficients were determined. It is found that the convective heat transfer coefficients decrease with an increase in rate of heating. The experimental error in terms of percent uncertainty was also evaluated.

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23

Salibindla, Ashwanth K. R., Rabin Subedi, Victor C. Shen, Ashik U. M. Masuk, and Rui Ni. "Dissolution-driven convection in a heterogeneous porous medium." Journal of Fluid Mechanics 857 (October 15, 2018): 61–79. http://dx.doi.org/10.1017/jfm.2018.732.

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Motivated by subsurface carbon sequestration, an experimental investigation of dissolution-driven Rayleigh–Darcy convection using two miscible fluids in a Hele-Shaw cell is conducted. A thin horizontal layer of circular impermeable discs is inserted to create an environment with heterogeneous and anisotropic permeability. The Sherwood number that measures the convective mass transfer rate between two fluids at the interface is linked to different parameters of the disc layer, including the disc size, spacing, layer permeability and its relative height with respect to the fluid interface. It is surprising that the convective mass transfer rate in our configuration is dominated by the disc spacing, but almost independent of either the disc size or the mean permeability of the layer. To explain this dependence, the convective mass transfer rate is decomposed into the number, velocity and density contrast of fingers travelling through the disc layer. Both the number and density contrast of fingers show dependences on the disc layer permeability, even though the product of them, the mass transfer rate, does not. In addition, the density contrast also shows a non-monotonic dependence on the disc spacing. The transition point is at a spacing that is close to the finger width. Based on this observation, a simple model based on mixing and scale competition is proposed, and it shows an excellent agreement with the experimental results.

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24

Aravind, G. P., K. M. Muhammed Rafi, and M. Deepu. "Numerical study on passive convective mass transfer enhancement." Journal of Physics: Conference Series 822 (April 11, 2017): 012064. http://dx.doi.org/10.1088/1742-6596/822/1/012064.

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25

RAI, B. N., and S. N. UPADHYAY. "NATURAL CONVECTIVE MASS TRANSFER IN SHORT VERTICAL ANNULI." Chemical Engineering Communications 36, no. 1-6 (July 1985): 93–97. http://dx.doi.org/10.1080/00986448508911248.

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26

Hassan, Ibrahim, Inderjit Nirdosh, and Gomaa Sedahmed. "FREE CONVECTIVE MASS TRANSFER BEHAVIOR OF FINNED TUBES." Chemical Engineering Communications 201, no. 3 (November 20, 2013): 367–79. http://dx.doi.org/10.1080/00986445.2013.773424.

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27

Muzzio, Adriano. "Convective heat and mass transfer in porous media." Meccanica 27, no. 2 (June 1992): 143–44. http://dx.doi.org/10.1007/bf00420593.

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28

Leskoŝek, I., V. Nedović, and M. Petkovska. "EFFECT OF CONVECTIVE MASS TRANSFER ON BEER DIAFILTRATION." Journal of the Institute of Brewing 103, no. 5 (September 10, 1997): 279–82. http://dx.doi.org/10.1002/j.2050-0416.1997.tb00956.x.

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29

Isah, B. Y., M. M. Altine, and S. K. Ahmad. "Thermal Radiation and Variable Pressure Effects on Natural Convective Heat and Mass Transfer Fluid Flow in Porous Medium." Nigerian Journal of Basic and Applied Sciences 27, no. 1 (May 26, 2020): 48–58. http://dx.doi.org/10.4314/njbas.v27i1.7.

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The study investigates the interaction of free convective flow with thermal radiation and variable pressure on natural convective heat and mass transfer fluid flow in porous medium. Solutions for time dependent energy, concentration and momentum equations were obtained by the perturbation series method after transforming into ordinary differential equations. The effect of various flow parameters such as: suction/injection ( δ) radiation (R ) magnetic field (M ) heat source (S ) chemical reaction ( Rc) on the skin friction, rate of heat transfer, velocity, temperature, and concentration profile influencing the physical situation were discussed with the aid of line graphs. Keywords: Thermal Radiation, Variable pressure, Perturbation, Natural Convection

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30

Lima, Elisiane S., João M. P. Q. Delgado, Ana S. Guimarães, Wanderson M. P. B. Lima, Ivonete B. Santos, Josivanda P. Gomes, Rosilda S. Santos, et al. "Drying and Heating Processes in Arbitrarily Shaped Clay Materials Using Lumped Phenomenological Modeling." Energies 14, no. 14 (July 16, 2021): 4294. http://dx.doi.org/10.3390/en14144294.

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This work aims to study the drying of clay ceramic materials with arbitrary shapes theoretically. Advanced phenomenological mathematical models based on lumped analysis and their exact solutions are presented to predict the heat and mass transfers in the porous material and estimate the transport coefficients. Application has been made in hollow ceramic bricks. Different simulations were carried out to evaluate the effect of drying air conditions (relative humidity and speed) under conditions of forced and natural convection. The transient results of the moisture content and temperature of the brick, and the convective heat and mass transfer coefficients are presented, discussed and compared with experimental data, obtaining a good agreement. It was found that the lower the relative humidity is and the higher the speed of the drying air is, the higher the convective heat and mass transfer coefficients are at the surface of the brick and in the holes, and the faster the moisture removal material and heating is. Based on the predicted results, the best conditions for brick drying were given. The idea is to increase the quality of the brick after the process, to reduce the waste of raw material and energy consumption in the process.

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31

Kumar, Mahesh. "EXPERIMENTAL FORCED SOLAR THIN LAYER GINGER DRYING." Facta Universitatis, Series: Mechanical Engineering 14, no. 1 (April 1, 2016): 101. http://dx.doi.org/10.22190/fume1601101k.

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In this research paper, the convective and the evaporative heat transfer coefficients of ginger (zingiber officinale) drying in an indirect solar cabinet dryer under the induced forced convection mode is presented. Experiments were conducted during the month of March 2015 under the climatic conditions of Hisar, India (29°5’5”N latitude and 75°45’55”E longitude). The experimental data obtained for solar drying of a constant ginger mass of 150 g has been used to determine constants ‘C’ and ‘n’ in the Nusselt number expression using linear regression analysis; consequently, the convective and the evaporative heat transfer coefficients have been evaluated. The average value of constants ‘C’ and ‘n’ were evaluated as 0.999 and 0.318, respectively. The average values of the convective and the evaporative heat transfer coefficients were found to be 3.95 W/m2 °C and 160.47 W/m2 °C, respectively, for the given mass samples of ginger. The average collector efficiency was observed to be 14.5%. The experimental error in terms of percentage uncertainty was found to be 20.87%.

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32

Rebhi, Redha, Mahmoud Mamou, and Noureddine Hadidi. "Onset of Linear and Nonlinear Thermosolutal Convection with Soret and Dufour Effects in a Porous Collector under a Uniform Magnetic Field." Fluids 6, no. 7 (July 3, 2021): 243. http://dx.doi.org/10.3390/fluids6070243.

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The present paper reports on an analytical and numerical study of combined Soret and Dufour effects on thermosolutal convection in a horizontal porous cavity saturated with an electrically conducting binary fluid under a magnetic field. The horizontal walls of the system are subject to vertical uniform fluxes of heat and mass, whereas the vertical walls are assumed to be adiabatic and impermeable. The main governing parameters of the problem are the Rayleigh, the Hartmann, the Soret, the Dufour and the Lewis numbers, the buoyancy ratio, the enclosure aspect ratio, and the normalized porosity of the porous medium. An asymptotic parallel flow approximation is applied to determine the onset of subcritical nonlinear convection. In addition, a linear stability analysis is performed to predict explicitly the thresholds for the onset of stationary, overstable and oscillatory convection, and the Hopf bifurcation as functions of the governing parameters. The combined effect of a magnetic field, Soret and Dufour parameters have a noticeable influence on the intensity of the convective flow, the heat and mass transfer rates, and the thresholds of linear convection. It is found that the imposition of a magnetic field delays the onset of convection and its intensification can lead to the total suppression of the convective currents. The heat transfer rate increases with the Dufour number and decreases with the Soret number and vice versa for the mass transfer rate.

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33

Podoplelov, Evgeniy, Aleksey Bal'chugov, Anatoliy Dement'ev, and Anatoliy Glotov. "MATHEMATICAL MODELING OF THERMOGRAVITATIONAL AND THERMOCA-PILLARY CONVECTION IN GAS-LIQUID PROCESSES." Scientific Papers Collection of the Angarsk State Technical University 2021, no. 1 (July 5, 2021): 58–66. http://dx.doi.org/10.36629/2686-7788-2021-1-1-58-66.

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. The interaction of gas and liquid phases in some cases is accompanied by the spontaneous occur-rence of convective flows and turbulent pulsations at the phase boundary and in adjacent areas. Hy-drodynamic instability allows to accelerate the interfacial transfer of matter and leads to an increase in mass transfer coefficients. Research in this field is not only theoretical, but also practical, since sur-face convection can be artificially created in apparatus for intensifying the mass exchange process.

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34

Setford, Patrick, David Jeffery, Paul Grbin, and Richard Muhlack. "Mass Transfer of Anthocyanins during Extraction from Pre-Fermentative Grape Solids under Simulated Fermentation Conditions: Effect of Convective Conditions." Molecules 24, no. 1 (December 26, 2018): 73. http://dx.doi.org/10.3390/molecules24010073.

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The colour of red wine is largely determined by the concentration of anthocyanins that are extracted from grape skins during fermentation. Because colour is a key parameter in determining the overall quality of the finished product, understanding the effect of processing variables on anthocyanin extraction is critical for producing a red wine with the desired sensorial characteristics. In this study, the effect of convective conditions (natural and forced) on the mass transfer properties of malvidin-3-glucoside (M3G) from pre-fermentative grape solids was explored at various liquid phase conditions representing stages of fermentation. A mathematical model that separates solid and liquid phase mass transfer parameters was applied to experimental extraction curves, and in all cases, provided a coefficient of determination exceeding 0.97. Calculated mass transfer coefficients indicated that under forced convective conditions, the extraction process was controlled by internal diffusion whereas under natural convection, both internal diffusion and liquid-phase mass transfer were relevant in determining the overall extraction rate. Predictive simulations of M3G extraction during active fermentation were accomplished by incorporating the current results with a previously developed fermentation model, providing insight into the effect of a dynamic liquid phase on anthocyanin extraction.

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35

Wang, Xue Ping, Wei Wei Cao, Yong Song, and Zhen Wei Zhang. "Analysis of Mass Transfer during Loose Material’s Convective Drying." Advanced Materials Research 317-319 (August 2011): 2018–21. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.2018.

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Abstract. The thesis focuses on how to get the mathematical model of mass transfer under some certain simplified conditions and how to gain the moisture content of materials under drying. In this process, authors utilized phenomenological equations of heat and moisture transfer and analyzed the relationship and cross effects between force and flow, which were about various kinds of heat and mass transfer. In addition, the authors also used computer simulation in drying process. The result of the study is that drying rate depends on the speed of the internal moisture migration. The conclusions of this thesis have great significance for selecting the dryer and in the actual production.

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36

Trevisan, O. V., and A. Bejan. "Combined Heat and Mass Transfer by Natural Convection in a Vertical Enclosure." Journal of Heat Transfer 109, no. 1 (February 1, 1987): 104–12. http://dx.doi.org/10.1115/1.3248027.

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The phenomenon of natural convection caused by combined temperature and concentration buoyancy effects is studied analytically and numerically in a rectangular slot with uniform heat and mass fluxes along the vertical sides. The analytical part is devoted to the boundary layer regime where the heat and mass transfer rates are ruled by convection. An Oseen-linearized solution is reported for tall spaces filled with mixtures characterized by Le = 1 and arbitrary buoyancy ratios. The effect of varying the Lewis number is documented by a similarity solution valid for Le >1 in heat-transfer-driven flows, and for Le <1 in mass-transfer-driven flows. The analytical results are validated by numerical experiments conducted in the range 1≤H/L≤4, 3.5×105≤Ra≤7×106, −11≤n≤9, 1≤Le≤40, and Pr=0.7, 7. “Massline” patterns are used to visualize the convective mass transfer path and the flow reversal observed when the buoyancy ratio n passes through the value −1.

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Aliev, M. R. "Experimental study of mass transfer in a convective mass-transfer apparatus for membrane plasma exchange." Petroleum Chemistry 56, no. 5 (May 2016): 450–53. http://dx.doi.org/10.1134/s0965544116050029.

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Sampath Kumar, Poojari Borappa, Bijjanal Jayanna Gireesha, Basavarajappa Mahanthesh, and Rama Subba Reddy Gorla. "Nonlinear Thermal Convection in Jeffrey Liquid Flow with Cross Diffusion Effects Past a Stretched Surface." Diffusion Foundations 11 (August 2017): 84–98. http://dx.doi.org/10.4028/www.scientific.net/df.11.84.

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Nonlinear thermal convection in heat and mass transfer mechanism of dissipating Jeffrey liquid is investigated. The impact of cross diffusion and convective conditions are also accounted. Before integrating pertinent partial differential equations; a set similarity variables are employed to reduce them into multidegree ordinary differential equations. The validation process comprised a comparison with existing data, reaching an excellent agreement. Later, the influence of distinct physical parameters on diverse flow characteristics are comprehensively discussed and analyzed. It is established that the nonlinear convection is favourable for the escalation of the thickness of momentum boundary layer. Further, the convective conditions are used as controlling constraints.

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Magherbi, M., H. Abbassi, N. Hidouri, and A. Brahim. "Second Law Analysis in Convective Heat and Mass Transfer." Entropy 8, no. 1 (February 2, 2006): 1–17. http://dx.doi.org/10.3390/e8010001.

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Barth, Christina, Mohamed Samaha, Hooman Tafreshi, and Mohamed Gad-el-Hak. "Convective Mass Transfer From Submerged Superhydrophobic Surfaces: Turbulent Flow." International Journal of Flow Control 5, no. 3-4 (September 2013): 143–52. http://dx.doi.org/10.1260/1756-8250.5.3-4.143.

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Iskra, Conrad R., Chris James, Prabal Talukdar, Carey J. Simonson, Phalguni Mukhopadhyaya, Mavinkal K. Kumaran, and S. W. Dean. "Convective Mass Transfer Coefficients for Gypsum and Wood Paneling." Journal of ASTM International 6, no. 4 (2009): 102036. http://dx.doi.org/10.1520/jai102036.

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Krysa, J., and A. A. Wragg. "Free convective mass transfer at up-pointing pyramidal electrodes." International Journal of Heat and Mass Transfer 40, no. 15 (October 1997): 3717–27. http://dx.doi.org/10.1016/s0017-9310(97)00022-7.

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KrÃ½sa, J. "Free convective mass transfer at up-pointing truncated cones." Chemical Engineering Journal 85, no. 2-3 (January 28, 2002): 147–51. http://dx.doi.org/10.1016/s1385-8947(01)00219-4.

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Pekdemir, Turgay, Thomas W. Davies, and Osman N. Sara. "Convective Mass Transfer from Cylinders in a Jet Flow." Industrial & Engineering Chemistry Research 37, no. 4 (April 1998): 1560–66. http://dx.doi.org/10.1021/ie970634n.

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Ahlberg, Elisabet, Fredrik Falkenberg, José A. Manzanares, and David J. Schiffrin. "Convective mass transfer to partially recessed and porous electrodes." Journal of Electroanalytical Chemistry 548 (May 2003): 85–94. http://dx.doi.org/10.1016/s0022-0728(03)00227-4.

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Kumar, Sanjay, and G. N. Tiwari. "Estimation of convective mass transfer in solar distillation systems." Solar Energy 57, no. 6 (December 1996): 459–64. http://dx.doi.org/10.1016/s0038-092x(96)00122-3.

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Krýsa, J., A. A. Wragg, and M. A. Patrick. "Free convective mass transfer at down-pointing truncated cones." International Journal of Heat and Fluid Flow 23, no. 1 (February 2002): 96–104. http://dx.doi.org/10.1016/s0142-727x(01)00130-8.

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Krysa, J., and A. A. Wragg. "Free convective mass transfer at down-pointing pyramidal electrodes." International Journal of Heat and Mass Transfer 39, no. 6 (April 1996): 1297–305. http://dx.doi.org/10.1016/0017-9310(95)00197-2.

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Sahin, Medine, and İbrahim Doymaz. "Estimation of cauliflower mass transfer parameters during convective drying." Heat and Mass Transfer 53, no. 2 (May 18, 2016): 507–17. http://dx.doi.org/10.1007/s00231-016-1835-0.

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Avramidis, Stavros, and Savvas G. Hatzikiriakos. "Convective Heat and Mass Transfer in Nonisothermal Moisture Desorption." Holzforschung 49, no. 2 (January 1995): 163–67. http://dx.doi.org/10.1515/hfsg.1995.49.2.163.

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