Evaporative cooling of air in impinging streams

Yao, B.; Berman, Yuli; Tamir, Abraham

doi:10.1002/aic.690410707

Cited by 25 publications

(11 citation statements)

References 17 publications

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“…Ž . 2002, 2001a,b , evaporative cooling of air Yao et al, 1995, Ž . bioreactions Sievers et al, 1995Sohrabi and Marvast, 2000 , Ž liquid-liquid extraction Berman and Tamir, 2000;Dehkordi .…”

Section: Introductionmentioning

confidence: 99%

Liquid–liquid extraction with chemical reaction in a novel impinging‐jets reactor

Dehkordi

2002

AIChE Journal

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Section: Introductionmentioning

confidence: 99%

Liquid–liquid extraction with chemical reaction in a novel impinging‐jets reactor

Dehkordi

2002

AIChE Journal

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“…The volumetric water evaporation rate and volumetric heat transfer coefficient were calculated by the following equations [9,10,16] :…”

Section: Evaluation Of Volumetric Water Evaporation Rate and Volumetrmentioning

confidence: 99%

“…); X o is the outlet moisture content of paddy (kg=kg, d.b. ); V r is the volume of the drying chamber (0.018 m 3 ); h v is the volumetric heat transfer coefficient (W=m 3 K); k is the latent heat of vaporization (kJ=kg); DT lm is the logarithmic mean temperature difference, which was calculated in the case of hot-air drying as [16] :…”

Section: Evaluation Of Volumetric Water Evaporation Rate and Volumetrmentioning

confidence: 99%

Comparative Evaluation of Hot-Air and Superheated-Steam Impinging Stream Drying as Novel Alternatives for Paddy Drying

et al. 2013

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An investigation was conducted on impinging stream drying of moist paddy using hot air and superheated steam as the drying media. Drying experiments were divided into two parts: namely, one-pass and two-pass drying. The volumetric water evaporation rate, volumetric heat transfer coefficient, and specific energy consumption of the drying system at various conditions were assessed; in the case of superheated-steam drying, the effect of steam recycle was also assessed. The quality of dried paddy was evaluated in terms of color, head rice yield, and degree of starch gelatinization. In the case of one-pass drying, an increase in the drying temperature led to a significant increase in the volumetric water evaporation rate and volumetric heat transfer coefficient. On the other hand, in the case of two-pass drying, an increase in the drying temperature led to a significant decrease in the volumetric heat transfer coefficient; the volumetric water evaporation rate was not significantly affected, however. The specific energy consumption decreased with an increase in the drying temperature. At the same temperature, using superheated steam as the drying medium led to lower specific energy consumption; higher level of steam recycle also led to more energy conservation. The color of the dried paddy was not affected by the change in the drying temperature; superheated-steam-dried paddy was redder and more yellow than the hot-air-dried paddy. An increase in the drying temperature led to decreased percentage of head rice yield. Superheated-steam drying helped enhance the level of starch gelatinization in comparison with hot-air drying at the same temperature. Nevertheless, drying at the highest tested temperature led to a lower level of starch gelatinization.

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“…Generally, the performance of a dryer could be evaluated in terms of the volumetric water evaporation rate and volumetric heat transfer coefficient, which are calculated as: [1,10] Volumetric water evaporation rate (N v ):…”

Section: Calculation Of Volumetric Water Evaporation Rate and Volumetmentioning

confidence: 99%

Performance and Energy Consumption of an Impinging Stream Dryer for High-Moisture Particulate Materials

2009

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Impinging stream dryers (ISDs) are a novel alternative to flash dryers for high-moisture particulate materials. However, studies on hydrodynamics and heat/mass transfer as well as drying characteristics of an ISD are still limited or incomplete. The effects of various geometric and operating parameters of an ISD on its performance, in particular, are not conclusive. In addition, ISD was tested mainly with model materials that do not represent the real challenge of higher-moisture materials, which tend to be sticky in nature. In this study, modifications were made to an existing coaxial two-impinging stream dryer of Sathapornprasath et al. [1] to make it more suitable for high-moisture particulate materials. This newly modified dryer was then evaluated for its performance in terms of the volumetric water evaporation rate and volumetric heat transfer coefficient. Soy residue (okara), which is a by-product of a soymilk production process, was used as a test material. Particle mean residence time was also evaluated and the results were used to support and explain the performance data of the dryer. Finally, the specific energy consumption of the dryer was assessed at various geometric and operating conditions. The maximum volumetric water evaporation rate was found to be around 520 kg water /m 3 h and the maximum volumetric heat transfer coefficient was around 4,500 W/m 3 K for the mean particle residence time of approximately 0.97-1.74 s. In terms of the specific energy consumption the lowest specific energy consumption was found to be around 5.6 MJ/kg water.

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Evaporative cooling of air in impinging streams

Cited by 25 publications

References 17 publications

Liquid–liquid extraction with chemical reaction in a novel impinging‐jets reactor

Liquid–liquid extraction with chemical reaction in a novel impinging‐jets reactor

Comparative Evaluation of Hot-Air and Superheated-Steam Impinging Stream Drying as Novel Alternatives for Paddy Drying

Performance and Energy Consumption of an Impinging Stream Dryer for High-Moisture Particulate Materials

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