结合不同的喷嘴概念,同时优化对流干燥应用中的传热及其均匀分布

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL Drying Technology Pub Date : 2023-10-09 DOI:10.1080/07373937.2023.2260867
Tobias Nienke, Juan Sebastian Gomez Bonilla, Arno Kwade, Daniel Eggerath
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引用次数: 0

摘要

精密的涂层工艺要求灵敏的干燥工艺。本文研究了撞击式和无撞击式混合对流干燥喷嘴的工作原理。无冲击喷嘴具有良好的均匀性,而冲击喷嘴具有较高的换热性和较大的非均匀性。喷嘴类型间的体积流量比、横向距离、基板距离和撞击角是本研究的参数。与纯无冲击喷嘴相比,这种组合可以在适度损失分布均匀性的情况下实现更大的传热。具有较小横向距离和较小基底距离的发散式撞击射流是有利的。此外,考虑到能量需求,无冲击喷嘴由于阻力较低,可以在较低的风机功率下提供相同的体积流量。因此,混合喷嘴中撞击分量的减少在能量方面是有利的。关键词:涂层辊辊干燥喷嘴传热披露声明作者未报道潜在的竞争利益。表1。不同体积流量比和喷嘴类型的出口速度和雷诺数。显示表2。不同撞击角度的变异系数。下载csv显示表
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Combination of different nozzle concepts for simultaneous optimization of heat transfer and its uniform distribution in convection drying applications
AbstractPrecise coating processes demand sensitive drying processes. The present work investigates the operation of hybrid convective drying nozzles for combining impingement nozzles with impingement-free nozzles. Impingement-free nozzles show good uniformity, whereas impingement nozzles are characterized by higher heat transfer but greater non-uniformity across the pitch. Volumetric flow ratio between the nozzle types, lateral distance, substrate distance and angle of impingement are the parameters of this study. Compared with purely impingement-free nozzles, the combination can achieve increased heat transfer with moderate losses in distribution uniformity. A divergent impingement jet with a small lateral distance and a small substrate distance proves to be advantageous. In addition, a consideration of energy requirements shows that impingement-free nozzles, due to their lower resistance, can deliver the same volume flow rates with lower blower power. As a result, the reduction of the impingement component in the hybrid nozzle is advantageous in terms of energy.Keywords: CoatingRoll2Rolldrying nozzleheat transfer Disclosure statementNo potential competing interest was reported by the authors.Table 1. Outlet velocity and Reynolds numbers for different volumetric flow ratios and nozzle types.Display TableTable 2. Coefficient of variation for different impingement angles.Download CSVDisplay Table
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来源期刊
Drying Technology
Drying Technology 工程技术-工程:化工
CiteScore
7.40
自引率
15.20%
发文量
133
审稿时长
2 months
期刊介绍: Drying Technology explores the science and technology, and the engineering aspects of drying, dewatering, and related topics. Articles in this multi-disciplinary journal cover the following themes: -Fundamental and applied aspects of dryers in diverse industrial sectors- Mathematical modeling of drying and dryers- Computer modeling of transport processes in multi-phase systems- Material science aspects of drying- Transport phenomena in porous media- Design, scale-up, control and off-design analysis of dryers- Energy, environmental, safety and techno-economic aspects- Quality parameters in drying operations- Pre- and post-drying operations- Novel drying technologies. This peer-reviewed journal provides an archival reference for scientists, engineers, and technologists in all industrial sectors and academia concerned with any aspect of thermal or nonthermal dehydration and allied operations.
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