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 paper, the performance of a monolithic biofilm reactor (MBR) as a novel reactor configuration for syngas fermentation was evaluated in abiotic conditions within a wide range of gas flow rates and liquid flow rates.
79 citations
TL;DR: In this paper, a 2D direct numerical simulation of liquid-liquid slug flow in microchannels is presented, which reveals that mass transfer is strongly influenced by the flow structure inside the droplet and that the confinement of the droplets due to the channel size leads to an enhancement of mass transfer compared to cases where the droppers are not constrained by the walls.
79 citations
TL;DR: In this article, a new method of measuring local mass transfer for highly complex geometries is demonstrated, combining gypsum dissolution and X-ray computed tomography (CT).
Abstract: A new method of measuring local mass transfer for highly complex geometries is demonstrated. The method combines gypsum dissolution and X-ray computed tomography (CT). An object coated in gypsum is CT scanned before and after exposure to fluid flow. Digital three-dimensional pre- and post-flow geometries are created using the CT data, and the local dissolution thickness is determined by subtracting the post-flow from the pre-flow object. The method is first demonstrated for cylinders in cross-flow and validated with mass and heat transfer data. The measurements agree with values from correlations reported in the literature when scaled using Reynolds, Sherwood, and Schmidt numbers. The method is then applied to measure local mass transfer for the complex geometry of a 0.75-scale branching scleractinian coral Stylophera pistillata. Local Sherwood numbers vary between nearly zero on the backward facing surfaces of the downstream branches of the coral and nearly 200 at the tips of the branches at the top of the coral. The upstream facing surfaces at radii between 20 and 70 % of the overall radius of the coral experience Sherwood numbers close to 100. The local measurements are integrated to produce a bulk mass transfer coefficient that lies within the range of previous bulk measurements in the literature for similar coral species. With this method, local mass transfer rates can be measured for complex objects in laboratory or natural in situ flow environments. These are geometries for which only bulk measurements were previously possible.
79 citations
TL;DR: In this article, the authors measured the interfacial area in the Taylor gas-liquid flow in a microchannel using the Danckwerts' (chemical) method, using CO2 absorption from the CO2/N2 mixture into KHCO3/K2CO3 buffer solutions, containing NaOCl as a catalyst.
79 citations
01 Oct 1983
TL;DR: In this paper, an equation for predicting heat transfer coefficients for nucleate boiling of mixtures is derived, which contains only one adjustable parameter and the liquid-phase mass transfer coefficient.
Abstract: An equation for predicting heat transfer coefficients for nucleate boiling of mixtures is derived. This expression contains only one adjustable parameter and the liquid-phase mass transfer coefficient. If the adjustable parameter is put equal to unity, comparison with the most recent data for the SF/sub 6/-CF/sub 2/-Cl/sub 2/ system gives a mass transfer coefficient of 2 X 10/sup -4/ m/s, which is of the same order of magnitude as the value obtained in physical and chemical absorption and in fallingfilm vaporization. The new equation corresponds particularly well with the experimental observation that the heat transfer coefficient is less dependent on the heat flux density and the pressure for nucleate boiling of mixtures than in the case of the pure components.
79 citations