<i>Fluid Dynamics and Heat Transfer</i>

Knudsen, James G.; Katz, Donald L.; Street, Robert E.

doi:10.1063/1.3060727

Cited by 299 publications

(224 citation statements)

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“…It is important that the flow be laminar so that the sample environment can be accurately determined. Poiseuille flow within the chamber results in a parabolic velocity profile due to the wall separation being small compared to the cylinder radii (Knudsen and Katz, 1958). In the older horizontal flat plate designs, the aerosol laminar remained centred between the plates, but with vertical chambers there is the added complication of buoyant circulation due to the temperature gradient, (Sinnarwalla and Alofs, 1973): air near the cold wall will tend to sink; air near the warm wall will tend to rise.…”

Section: Principle Of Operationmentioning

confidence: 99%

Manchester Ice Nucleus Counter (MINC) measurements from the 2007 International workshop on Comparing Ice nucleation Measuring Systems (ICIS-2007)

et al. 2011

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Abstract. An ice nucleus counter was developed and constructed to enable investigation of potential ice nucleating materials. The Manchester Ice Nucleus Chamber (MINC) is a concentric-cylinder continuous flow diffusion chamber (CFDC). A full explanation of the MINC instrument is given here, along with first results and a comparison to an established instrument of similar design (Colorado State University CFDC) during sampling of common ice nucleating aerosols at the 2007 International workshop on Comparing Ice nucleation Measuring Systems (ICIS-2007). MINC and CSU-CFDC detected the onset of ice nucleation under similar conditions of temperature and supersaturation for several different types of ice nuclei. Comparisons of the ratio of ice nuclei to total aerosol concentrations as a function of supersaturation with respect to water (SS w ) showed agreement within one order of magnitude. Possible reasons for differences between the two instruments relating to differences in their design are discussed, along with suggestions to future improvements to the current design.

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Section: Principle Of Operationmentioning

confidence: 99%

Manchester Ice Nucleus Counter (MINC) measurements from the 2007 International workshop on Comparing Ice nucleation Measuring Systems (ICIS-2007)

et al. 2011

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“…Graetz in 1885 developed an infinite series solution to the analogous problem of heat transfer under the condition of constant wall temperature [Knudsen & Katz, 1958]. The solution can be immediately applied to mass transfer with constant wall concentration, simply substituting the Sherwood and Smidth numbers to the Nuselt and Prandtl numbers.…”

Section: Mass Transfer In Hollow Fibre Lumenmentioning

confidence: 99%

“…Mass or heat transport for laminar flow in various geometries and under various boundary conditions was investigated by several authors, beginning with the classical work of Graetz for heat transfer in circular ducts with constant wall temperature [Knudsen & Katz, 1958]. Reference can be made to the work of [Siegel et al, 1958] for heat transfer in circular duct with uniform heat flux, [Hatton & Quarmby, 1962] for annular ducts and [Nunge and Gill, 1966] for a tube in tube heat exchanger.…”

Section: Mass Transfer In Hollow Fibre Contactorsmentioning

confidence: 99%

Recovery of Biosynthetic Products Using Membrane Contactors

Gostoli¹

2011

Mass Transfer - Advanced Aspects

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“…The friction factor varies for different ratios of ⁄ , see Figure 2 for explanation. Equation (23) shows the equation from Cornish, Lea and Tadros, reproduced in Knudsen and Katz [13] for calculation of the friction factor for rectangular conduits. The equation has been adjusted by a factor 4 because the Darcy friction factor is 4 times larger than the friction factor defined in [12].…”

Section: Pressure Dropmentioning

confidence: 99%

Theoretical and Experimental Investigation of a Heat Exchanger Suitable for a Hybrid Ventilation System

2013

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A key component in low energy houses is the heat recovery from the ventilation air. Over recent years, the most frequently used ventilation type is the mechanical ventilation with heat recovery. This kind of ventilation results in high heat recovery but does unfortunately consume a considerable amount of electrical energy. Natural or hybrid ventilation has the potential to consume less electricity but normally lacks heat recovery, leading to high-energy consumption for heating, and potentially low comfort. This article describes an investigation of a natural/hybrid ventilation system equipped with heat recovery. One of the key challenges in designing the heat exchanger is to keep the pressure drop low. At the same time the heat recovery rate has to be high. The results from the measurements show that it is possible to design a water-to-air heat exchanger with a temperature efficiency of approximately 80% with a pressure drop of about 1 Pa at air flows corresponding to 0.35 L/(s·m²) building area. This type of ventilation system has the potential to offer a high thermal comfort, high heat recovery rate at the same time as the electrical consumption from fans is kept low. Old buildings with a natural ventilation system without heat recovery could also be retrofitted with this type of ventilation system.

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Fluid Dynamics and Heat Transfer

Cited by 299 publications

References 0 publications

Manchester Ice Nucleus Counter (MINC) measurements from the 2007 International workshop on Comparing Ice nucleation Measuring Systems (ICIS-2007)

Manchester Ice Nucleus Counter (MINC) measurements from the 2007 International workshop on Comparing Ice nucleation Measuring Systems (ICIS-2007)

Recovery of Biosynthetic Products Using Membrane Contactors

Theoretical and Experimental Investigation of a Heat Exchanger Suitable for a Hybrid Ventilation System

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