Topic
Mass transfer coefficient
About: Mass transfer coefficient is a research topic. Over the lifetime, 7827 publications have been published within this topic receiving 168354 citations.
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TL;DR: In this article, a fully predictive mathematical model was developed for membrane distillation considering heat and mass transfers and concentration polarisation, and the effect of parameters such as thickness of cavity, temperature and feed flow rate were investigated.
75 citations
TL;DR: In this article, a new measuring technique involving concurrent chemical absorption of carbon dioxide and desorption of oxygen is developed for simultaneously evaluating the liquid-phase mass transfer coefficient kL and the specific area a of sparingly-soluble gas dispersions in stirred tanks containing an aqueous solution of inorganic electrolytes.
Abstract: A new measuring technique involving concurrent chemical absorption of carbon dioxide and desorption of oxygen is developed for simultaneously evaluating the liquid-phase mass transfer coefficient kL and the specific area a of sparingly-soluble gas dispersions in stirred tanks containing an aqueous solution of inorganic electrolytes. The method ensures that kL and a are evaluated under consistent hydrodynamic conditions.
Results from three different nonviscous systems show that at high agitation power, such that the average bubble diameter is between 0.2 and 2 mm, kL decreases with increasing power input and is dependent on the bubble diameter. This behavior is in contrast to the results of others at lower agitation levels or in nonelectrolytic liquids, but in general agreement with previous results for bubbles of the same diameter range produced in viscous, nonelectrolytic solutions.
75 citations
TL;DR: In this paper, the applicability of axial dispersion model (ADM) for the measurement of the gas-liquid mass transfer coefficient (kLa) in bubble columns is discussed.
Abstract: The applicability of axial dispersion model (ADM) for the measurement of the gas-liquid mass transfer coefficient (kLa) in bubble columns is discussed. It is shown that the misinterpretation of the concentration jump near the column inlet can lead to wrong conclusions regarding the mass transfer rates. It is further illustrated that some reported kLa dependencies on the superficial liquid velocity and the axial distance are resulted from the use of an incorrect model and can be rectified by an application of ADM. Finally, it is shown that ADM can be effectively used to calculate kLa a for: (a) highly viscous liquids, (b) in the presence of chemical reaction, (c) slurry reactors, and (d) the columns with different liquid inlet locations.
75 citations
TL;DR: In this article, a series of operational parameters of supercritical fluid extraction of soybean oil (pressure: 300-500 bar, temperature: 40-60°C, CO2 mass flow rate: 0.194-0.436 kg/h and characteristic particle size: 0238-1.059mm) were investigated in a laboratory scale apparatus.
75 citations
TL;DR: In this paper, the role of water vapor transfer in ammonia recovery from biogas slurry by vacuum membrane distillation was explored and the overall mass transfer coefficients, ammonia separation factors and ammonia fluxes were used to evaluate ammonia separation performance.
75 citations