MODELLING AND EXPERIMENTAL INVESTIGATION OF THE SHAPE CHANGE OF A SESSILE WATER DROPLET DURING FREEZING

2018 ◽  
Author(s):  
Xin Liu ◽  
Xuan Zhang ◽  
Jingchun Min
Keyword(s):  
Experimental Investigation ◽  
Water Droplet ◽  
Shape Change

Experimental Investigation on the Multiple Jets from a Single Droplet by Electrospinning

2010 ◽  
Vol 129-131 ◽  
pp. 365-369 ◽  
Author(s):  
Cheng Kun Liu ◽  
Mei Yu Chen ◽  
Run Jun Sun ◽  
Wei Hua Zhang ◽  
Zhao Huan Zhang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
High Speed ◽  
Great Increase ◽  
Shape Change ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Process Conditions ◽  
Single Droplet ◽  
Interesting Phenomenon ◽  
Multiple Jets

In electrospinning, outlook of fibrous assembly changes not only with the variation of collecting setups, but with the electrospinning process. For example, formation of multiple jets on a single droplet at special electrospinning conditions can produce several regions of fibrous webs simultaneously, which is bound to bring a great increase of production of nanofibers. The initiation method of multiple jets during electrospinning was derived through an experimental investigation by means of a high-speed camera, which was used to obtain the information of the shape change of a droplet along with process conditions, such as solution concentration, voltage and flow rate. Results showed that multiple jets could be initiated in a controlled manner when droplets experienced several cycles of dripping at relatively high voltages and flow rates in a certain concentration range. An interesting phenomenon of the auto-initiation of double jets was further observed in our experiment.

scholarly journals Experimental Investigation of Water Droplet Phase Change in Humidi-fied Air Flow

Mechanika ◽  
2020 ◽  
Vol 26 (3) ◽  
pp. 197-205
Author(s):  
Virginijus RAMANAUSKAS ◽  
Linas PAUKŠTAITIS ◽  
Gintautas MILIAUSKAS ◽  
Egidijus PUIDA
Keyword(s):  
Experimental Investigation ◽  
Phase Change ◽  
Experimental Research ◽  
Water Droplet ◽  
Research Method ◽  
Air Flow ◽  
Equivalent Diameter ◽  
Initial Water ◽  
Humidified Air ◽  
Droplet Phase

An experimental research method and an analysis of the results of a water droplet phase change in the additionally humidified air flow are presented. The diagrams of variation of the equivalent diameter of convectively heated water droplets are presented and analysed. The influence of initial water temperature and additionally humidifying air flow on the phase change of a droplet in transient regime is experimentally substantiated.

Experimental Investigation on Aerodynamic Behavior of a Compressor Cascade in Droplet Laden Flow

2013 ◽  
Author(s):  
Birger Ober ◽  
Franz Joos
Keyword(s):  
Experimental Investigation ◽  
Water Droplet ◽  
Gas Turbines ◽  
Renewable Energy Sources ◽  
Water Injection ◽  
Density Ratio ◽  
Experimental Investigations ◽  
Compressor Cascade ◽  
Discharge Flow ◽  
Air Compressor

The possibility to augment the power output of gas turbines by the use of water injection becomes more and more attractive in recent years as unsteadily available renewable energy sources become more present and the need of reserve power rises. Depending on the installed system, water injection may result in a two phase flow inside the compressor. The water droplet laden compressor flow promises benefits in efficiency and to some extent in performance and stability. The thermodynamic aspect has been thoroughly investigated as summarized by Eisfeld [1]. A promising approach is the stabilizing influence on highly stressed airfoils as experimentally investigated by Eisfeld and Joos [2] who conducted first systematic experimental investigations but were limited in the range of incidence angles. Multiple numerical investigations have been undertaken by different research groups which found similar results (e.g. Sun et al in [3]). The ongoing experimental investigation presented in this paper focuses on the influence of a droplet laden flow on an axial compressors aerodynamics over the range of relevant incidence flow angles. The result of the series of experiments is a comparison of a dry air compressor flow and a droplet laden air compressor flow at high velocity (Ma > 0.85). The variables were water load and incidence angle. The discussion will investigate the effects of the presence of water droplet on the compressor cascades discharge flow properties and their influence on the relevant performance parameters. For this a discussion of the loss coefficient the detailed discharge flow velocity and the axial velocity density ratio (AVDR) will take place.

Sign in / Sign up

Export Citation Format

Share Document