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contributor authorXu, Changxue
contributor authorZhang, Zhengyi
contributor authorHuang, Yong
contributor authorXu, Heqi
date accessioned2019-09-18T09:03:36Z
date available2019-09-18T09:03:36Z
date copyright7/26/2019 12:00:00 AM
date issued2019
identifier issn1087-1357
identifier othermanu_141_9_091013
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4258376
description abstractViscoelastic polymer solutions have been extensively utilized in inkjet printing for a variety of biomedical applications. The pinch-off of viscoelastic jets is a key step toward the generation of droplets in inkjet printing. This complex process is governed by the interplay of four stresses, including inertial stress, capillary stress, viscous stress, and elastic stress. Depending on polymer solution properties and process conditions, four types of pinch-off phenomenon were observed during inkjetting of viscoelastic alginate solutions. In this study, material properties of alginate solutions with different concentrations have been characterized, and three dimensionless numbers (Ohnesorge number Oh, Deborah number De, and Weber number We) have been proposed to analyze different pinch-off behaviors. The phase diagram in terms of these three dimensionless numbers has been constructed to classify the regimes for different pinch-off types during inkjetting of viscoelastic alginate solutions. It is found that (1) at low De and Oh, the capillary stress is mainly balanced by the inertial stress, resulting in front pinching. (2) At medium De and low Oh, with the increase of We, the pinch-off type may change from front pinching to hybrid pinching to exit pinching. (3) At low Oh and high De, the capillary stress is mainly balanced by the elastic stress, resulting in exit pinching. (4) At high Oh and De, the viscoelastic effect is dominant. With the increase of We, middle pinching turns to be exit pinching due to the increase in the initial ligament diameter near the forming droplet.
publisherAmerican Society of Mechanical Engineers (ASME)
titlePhase Diagram of Pinch-off Behaviors During Drop-on-Demand Inkjetting of Alginate Solutions
typeJournal Paper
journal volume141
journal issue9
journal titleJournal of Manufacturing Science and Engineering
identifier doi10.1115/1.4044252
journal fristpage91013
journal lastpage091013-6
treeJournal of Manufacturing Science and Engineering:;2019:;volume( 141 ):;issue: 009
contenttypeFulltext


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