Influence of feed viscosity on the two-phase flow inside the exit orifice of an effervescent atomizer and on resulting spray characteristics

Influence of feed viscosity on the two-phase flow inside the exit orifice of an effervescent atomizer and on resulting spray characteristics
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进料粘度对泡腾雾化器出口孔内两相流及其喷雾特性的影响

DOI:
10.1016/j.foodres.2015.04.047
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发表时间:
2015
影响因子:
8.1
通讯作者:
Schuchmann
Schuchmann
中科院分区:
农林科学1区
文献类型:
--
作者:
Stähle;Gaukel;Schuchmann

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该雾化器最初是为燃烧应用而开发的,据报道,它能以较低的工作成本将粘性液体雾化成小滴。这提供了通过雾化更高浓度的原料来提高喷雾干燥食品的能量效率的可能性。对于稳定的干燥过程,必须确保小液滴的稳定形成,这主要取决于出口孔内的两相流。在这项研究中,食品为基础的液体的粘度对出口孔内的流动模式的影响进行了研究,通过使用光学传感器测量随时间变化的气相分布。此外,在近喷嘴区域的喷雾以及喷雾滴的形状和大小的特征在于通过阴影照相术。结果表明,当出口孔内形成环形流时,雾化成小的球形液滴。相反,对于段塞流,存在非常大且变形的喷雾滴,这对于喷雾干燥目的是关键的。
The effervescent atomizer, originally developed for combustion applications, is reported to atomize viscous liquids into small drops at low working costs. This offers the possibility to enhance the energy efficiency of spray drying foodstuffs by the atomization of a higher concentrated feedstock. For a stable drying process a steady formation of small drops must be ensured which depends mainly on the two-phase flow inside the exit orifice. In this study, the influence of the viscosity of a food based liquid on the flow pattern inside the exit orifice was investigated by measuring the time-dependent gas phase distribution using an optical sensor. Further, the spray in the near nozzle region as well as the shape and the size of the spray drops was characterized by means of shadowgraphy. The results indicate an atomization into small and spherical drops when an annular flow is formed inside the exit orifice. In contrast, very large and deformed spray drops are present for a slug flow, which are critical for spray drying purposes.
DOI: --
发表时间: 2015
期刊:
影响因子: --
作者:
P. Stähle;V. Gaukel;H. Schuchmann
通讯作者: H. Schuchmann
DOI: --
发表时间: 2012
期刊:
影响因子: --
作者:
Madan Mohan Avulapati;R. Ravikrishna
通讯作者: R. Ravikrishna
聚乙烯吡咯烷酮溶液的泡腾雾化:液体特性和雾化器几何形状对液体分解和喷雾特性的影响
DOI: 10.1615/atomizspr.2013005849
发表时间: 2013
影响因子: 1.2
作者:
Schröder;Günther;Schuchmann;Gaukel
通讯作者: Gaukel
泡腾雾化和内部混合空气辅助雾化
DOI: --
发表时间: 1995
期刊:
影响因子: --
作者:
J. Chin
通讯作者: J. Chin