Eine remissionsfotometrische Meßmethode zur Bestimmung örtlicher Stoffübergangskoeffizienten bei Zwangskonvektion in Luft

Kottke, Volker; Blenke, Heinz; Schmidt, Kristina

doi:10.1007/bf02570663

Cited by 33 publications

(8 citation statements)

References 10 publications

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“…With this concept, it was possible to combine the advantages of capillary showers with the demand of plug insensitive operation and the aim of high throughput [1]. The atomizer is designed as a multiple-hole cylinder (Fig.…”

Section: _______________________mentioning

confidence: 99%

“…By T. Schröder and P. Walzel* In order to produce droplets with a narrow droplet size distribution, a new spraying system has been developed, i. e., a rotary atomizer with a multitude of comparatively large holes (LAMROT) 1) through which the liquid flow is laminar. With this concept, it was possible to combine the advantages of capillary showers with the demand of plug insensitive operation and the aim of high throughput [1].…”

Section: _______________________mentioning

confidence: 99%

“…In an experimental duct the local mass transfer coefficient b(x) can be determined from the measured surface mass density b(x) with 1) (1)…”

Section: Determination Of Local Mass Transfer Coefficientsmentioning

confidence: 99%

“…By using experimental methods for the visualization and determination of local heat and mass transfer, it is possible to investigate and optimize apparatus and plants. There are simple and effective methods for gas flow [1], based on convective mass transfer coupled with color reaction. But in many cases ± internal flow, separated flow, non-newtonian medias ± it is not allowed to transfer results from experiments in gas flow to liquid flow by applying the Reynold's analogy and an extended analogy of heat and mass transfer.…”

Section: Introductionmentioning

confidence: 99%

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Visualization and Determination of Local Heat and Mass Transfer at Solid Walls in Liquid Flow

Kühnel¹,

Kottke

1998

Chem. Eng. Technol.

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Section: _______________________mentioning

confidence: 99%

Section: _______________________mentioning

confidence: 99%

“…In an experimental duct the local mass transfer coefficient b(x) can be determined from the measured surface mass density b(x) with 1) (1)…”

Section: Determination Of Local Mass Transfer Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Visualization and Determination of Local Heat and Mass Transfer at Solid Walls in Liquid Flow

Kühnel¹,

Kottke

1998

Chem. Eng. Technol.

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“…Recently, a new method for an accurate determination of local mass and heat transfer coefficients on arbitrarily shaped surfaces in industrial equipment has been developed at the Institute for Chemical Engineering of the University of Stuttgart [2]. This method also allows the visualization of local mass and heat transfer distributions.…”

Section: Introductionmentioning

confidence: 99%

Local heat transfer and heat flux distributions in finned tube heat exchangers

Schüz

Kottke

1992

Chem Eng & Technol

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A detailed analysis of the effect of local heat transfer distributions, which were determined experimentally, on temperature distributions in the fins and in the fluid between two adjacent fins of finned tube heat exchangers is presented. The heat transfer distributions, obtained by a mass transfer technique, prove to be very inhomogeneous over the fin surface, leading to variable results for fin efficiency calculated by the conventional method. In addition, the effect of temperature variation in the fluid, which is usually neglected in fin analysis, is shown in many cases to exert a very strong influence on fin efficiency and total heat flux. For the optimization of fin designs, a combined analysis of local heat transfer, conduction resistance in the fin and temperature variation in the passage is indispensable.

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Effects of turbulence on heat and mass transfer in stagnation flows

Kottke

1989

Chem Eng & Technol

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The influence of turbulence on local heat and mass transfer is systematically analyzed. Essential prerequisite is the availability of measurement methods, based on convective mass transfer, which allow the visualization of heat and mass transfer distributions. The results show that, even at low turbulence intensities, the flow and transport phenomena are decisively influenced by the specific design of turbulence grids and the orientation of the grid wires with respect to the stagnation line. Thereby, two different flow mechanisms occur which may interact. The anisotropy of grid turbulence leads to the "wire-gap effect" depending on the actual position of the grid wires in relation to the stagnation line. The other mechanism is based on the wavy wake velocity distribution behind screens and grids which, in conjunction with the centrifugal instability of stagnation flows, may lead to longitudinal vortices. The results indicate why turbulence has not been sufficiently considered in the available (semi-) empirical correlations. Information needed for an accurate prediction of heat and mass transfer in turbulence flows is discussed.

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Eine remissionsfotometrische Meßmethode zur Bestimmung örtlicher Stoffübergangskoeffizienten bei Zwangskonvektion in Luft

Cited by 33 publications

References 10 publications

Visualization and Determination of Local Heat and Mass Transfer at Solid Walls in Liquid Flow

Visualization and Determination of Local Heat and Mass Transfer at Solid Walls in Liquid Flow

Local heat transfer and heat flux distributions in finned tube heat exchangers

Effects of turbulence on heat and mass transfer in stagnation flows

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