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Liquid jet in crossflow - Effect of liquid entry conditions

Prakash, R Surya and Sinha, Anubhav and Tomar, Gaurav and Ravikrishna, RV (2018) Liquid jet in crossflow - Effect of liquid entry conditions. In: EXPERIMENTAL THERMAL AND FLUID SCIENCE, 93 . pp. 45-56.

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Official URL: http://dx.doi.org/10.1016/j.expthermflusci.2017.12...

Abstract

The focus of the present article is to study the effect of liquid jet injection entry conditions on the structure of liquid jet in crossflow (JICF). The experiments are conducted over a range of liquid-to-air momentum ratios (Q similar to 3-100) and aerodynamic Weber numbers (We = 17-89). Control over the exit conditions of the injected liquid is achieved through the usage of different L/D ratios of the nozzle of the plain-orifice atomizer. The geometrical parameter L/D is varied between 10 and 100 in order to obtain fully-developed laminar flow, transition and turbulent flow. High-speed imaging and Shadowgraphy are used to study the trajectory, drop sizing and transient behaviour of the resultant spray. It is observed that the dependence of trajectory of the spray is not just limited to the momentum ratio, Q, but also requires correction factors with respect to the injection entry conditions, which are in turn related to L/D. The trajectory of the turbulent jet is found to be lower at all times when compared to that of a laminar jet for the corresponding conditions. This behaviour may be attributed to the inherent instabilities present in a turbulent jet as opposed to a perfectly laminar jet. Turbulent jets also observed atomize better, producing smaller droplets when compared to their laminar counterparts. Further, we also investigate the transient phenomena of the liquid jet breakup at different conditions with the aid of Proper Orthogonal Decomposition (POD) analysis. Distinct modes of breakup are captured for the laminar and turbulent cases.

Item Type: Journal Article
Additional Information: Copy right for the article belong to ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 11 Apr 2018 19:58
Last Modified: 29 Sep 2018 06:23
URI: http://eprints.iisc.ac.in/id/eprint/59500

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