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Analysis of interfacial dynamics in stratified and wavy-stratified flow using Laser Doppler Velocimetry

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Abstract

Interfacial behaviour of stratified and wavy-stratified flow is analysed in terms of measured velocity signals in liquid phase using Laser Doppler Velocimetry. Measurement of liquid height (interface level) is achieved using Laser Doppler Velocimetry synchronized with a computerised 3-dimensional traverse system. The precision obtained in measurement of air sheared interface level (liquid height) in this approach is 0.032±0.01 mm. First part of this paper deals with influence of gas and liquid superficial Reynolds numbers on the liquid height for stratified and wavy-stratified flow. With increase in liquid depth, waves are initiated at the gas-liquid interface which is precursor to slug formation. A critical liquid height for onset of slug formation is obtained in this part. The second part deals with the measurement of fluctuations occurring near to the air-sheared interface. These fluctuations are recorded in terms of local velocity of liquid phase and have been used to characterize the behaviour of air-water interface for stratified and wavy-stratified flow. Furthermore, influence of gas and liquid flow rates on local liquid velocity for different stratified and wavy-stratified flow conditions is analysed by plotting the axial velocity profiles in radial direction.

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Acknowledgements

The experimental test facility used in the present research is developed using the financial assistance from Science and Engineering Research Board (SERB), Department of Science and Technology (DST), India (sanction letter no. SB/S3/MIMER/0111/2013 dated 23-05-2014) and the Laser Doppler Velocimetry system is established using financial assistance from Centre of Excellence (COE) on Water Resources and Flood Management (sanction letter no. NPIU/TEQIP-II/FIN/47 dated 21-06-2013), Sardar Vallabhbhai National Institute of Technology, India.

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Authors and Affiliations

  1. Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, 395007, India

    Sunny Saini & Jyotirmay Banerjee

  2. Adani Institute of Infrastructure Engineering, Ahmedabad, Gujarat, 382421, India

    Jignesh Thaker

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  1. Sunny Saini
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Correspondence to Jyotirmay Banerjee.

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Saini, S., Thaker, J. & Banerjee, J. Analysis of interfacial dynamics in stratified and wavy-stratified flow using Laser Doppler Velocimetry. Exp. Comput. Multiph. Flow 4, 142–155 (2022). https://doi.org/10.1007/s42757-020-0083-1

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