On the Sherwood number correction due to Stefan flow

Andersson, Ronnie; Andersson, Bengt

doi:10.1016/j.ces.2021.117292

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…Larger Sherwood numbers represent a more effective mass convection. The Sherwood numbers also represent the enhancement of mass transport within the reactor system due to convection relative to diffusion. , Consequently, smaller channels provide more effective mass convection than larger channels. On the other hand, the maximum local Sherwood number often increases with an increase in the washcoat thickness, especially in smaller channel cases.…”

Section: Resultsmentioning

confidence: 99%

“…The local Sherwood number profiles along the length of the channel are presented in Figure under specified conditions in different channel heights and with different washcoat thicknesses. The Sherwood number represents the effectiveness of mass convection near the washcoat surface. , In the first half of the reactor, in which the mass convection transport occurs in the exact region needed, the local Sherwood number in smaller channel cases is greatly higher than that in larger channel cases. The results are entirely consistent with those obtained for the local Nusselt number.…”

Section: Resultsmentioning

confidence: 99%

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Computational Study of Transport Phenomena at the Microscale: Effects of Washcoat Thickness and Characteristic Length on the Heat and Mass Transfer Processes in Millisecond Reactors for Hydrogen Production

Chen

2023

Ind. Eng. Chem. Res.

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Transport phenomena in millisecond reactors are poorly understood due to extremely short contact times and nonequilibrium states. Numerical investigation of transport phenomena at the microscale was performed for hydrogen production by the steam-methanol reforming reaction. Heat and mass transport analyses were conducted, and dimensionless number analyses were carried out to gain insights into the nature of the transport processes. The effectiveness factor and Thiele modulus were calculated to understand how effectively the catalyzed washcoat is being used. The results indicated that the system is mass transfer limited because significant species gradients exist. The mass transfer rate is about 1 order of magnitude lower than the intrinsic reaction rate. Momentum diffusivity dominates the transport behavior, and convection is more significant compared to conduction and diffusion. Local Nusselt and Sherwood numbers of about 100 and about 55 can be obtained, respectively, with a pressure drop of less than about 200 Pa. Both the washcoat thickness and characteristic length are critically important in determining the catalyst effectiveness and reactor behavior. Large variations in the effectiveness factor must be accounted for to deliver accurate results. The results provide useful guidance in the operation and design of millisecond reactors by quantifying transport process variations and identifying the effectiveness of catalyzed washcoats.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Computational Study of Transport Phenomena at the Microscale: Effects of Washcoat Thickness and Characteristic Length on the Heat and Mass Transfer Processes in Millisecond Reactors for Hydrogen Production

Chen

2023

Ind. Eng. Chem. Res.

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“…𝑚𝑚 −3 A correlation of the Sherwood number in the case of low pressure vaporization allows the determination of the convective mass transfer coefficient 𝑘𝑘. It is determined by the mass diffusion coefficient D, the Reynolds number Re and the Schmidt number Sc [51][52]. The new formula of the exchanged flux by mass convection is presented as:…”

Section: Description Of Heat Exchanges Through the Evaporator-absorbermentioning

confidence: 99%

Mathematical Modeling of the Heat Generated through an Evaporator-Absorber Accompanied by Thermal Storage for the Solar Energy Applications

Latrache

Hammouch

Lamnaouar

et al. 2023

JERA

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An evaporator-absorber geometry allows the absorption of incident solar radiation andconverts it into thermal energy useful for the evaporation of a working fluid. The evaporator-absorberworks with two fluids: a heat transfer fluid transmitting heat to a working fluid, which, circulatesalong the thermal circuit composed of an evaporator, a turbine, a condenser and a pump. The aim ofthis research work is to analyze the heat transfer through the evaporator-absorber and to extract themathematical equations model the heat exchange process between the component elements of theevaporator-absorber: a serpentine tube, a working fluid and a cylindrical tube. In this case, theworking fluid is water, and the heat transfer fluid is air, which is heated by the thermal energyconverted from solar energy. The mathematical equations describing the heat transfer are extractedby using the nodal method and discretized by the finite difference method. Afterwards, the presentwork estimates the outlet temperature of each element of the evaporator-absorber and studies thestorage capacity of the cylindrical tube. Then, the water temperature distribution on the geometry ofthe evaporator and the required quantity of water and the number of spires to have a high outlettemperature of the water vapor are determined. As a result, the mathematical modeling estimated thatthe outlet temperature of the serpentine tube is higher than the outlet temperature of the water.Additionally, the temperature of the storage tube maintains its increase throughout the day. Thequality of the heat transfer in the serpentine tube is improved by placing the tube in a vertical positionand by adopting a lower volume of water compared to the maximum volume, which is supported bythis tube.

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Assessment of pillar-array electrodes for electrochemical flow reactors using a novel hydrodynamic electrode performance factor

De Rop,

Arenas,

De Wolf

et al. 2024

Chemical Engineering Journal

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On the Sherwood number correction due to Stefan flow

Cited by 12 publications

References 15 publications

Computational Study of Transport Phenomena at the Microscale: Effects of Washcoat Thickness and Characteristic Length on the Heat and Mass Transfer Processes in Millisecond Reactors for Hydrogen Production

Computational Study of Transport Phenomena at the Microscale: Effects of Washcoat Thickness and Characteristic Length on the Heat and Mass Transfer Processes in Millisecond Reactors for Hydrogen Production

Mathematical Modeling of the Heat Generated through an Evaporator-Absorber Accompanied by Thermal Storage for the Solar Energy Applications

Assessment of pillar-array electrodes for electrochemical flow reactors using a novel hydrodynamic electrode performance factor

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