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IFCPAR AR (ENGLISH) for CD - CEFIPRA

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<strong>CEFIPRA</strong><br />

Centre Franco-Indien pour la Promotion de la Recherche Avancée<br />

Duration: Three years (December, 2010 to November, 2013)<br />

Objectives<br />

Taylor bubble flows have been extensively studied in the past.<br />

Most of these studies are under (i) adiabatic conditions, (ii) not<br />

in the mini/micro geometries (iii) under steady flow conditions.<br />

Thus, the fundamental understanding of such flows is highly<br />

lacking in mini/micro channel geometries, under phasechange<br />

processes and oscillating flow conditions. All these<br />

conditions are vital <strong>for</strong> emerging applications of mini/micro<br />

phase-change thermal-fluid systems. Such systems routinely<br />

have oscillations, either intentionally generated or occurring<br />

due to flow instabilities. The project aims to understand<br />

thermo-hydrodynamic response of oscillating Taylor flows<br />

under a<strong>for</strong>ementioned boundary conditions and its<br />

subsequent effect on thermo-fluidic transport coefficients.<br />

Particle Image Velocimetry (PIV), Infra Red Thermography (IRT)<br />

and High Speed Videography (HSV) were employed to achieve<br />

this aim. The results have direct implications on design and<br />

understanding of many advanced and upcoming mini/micro<br />

systems such as pulsating heat pipes, compact phase-change<br />

electronics cooling modules, micro-fluidic devices and microbiochemical<br />

reactors and mass transfer systems.<br />

Accomplishments<br />

i) Infra-red thermography of single-phase developing<br />

laminar flows<br />

ii) Heat transfer enhancement due to air-water Taylor bubble<br />

flows<br />

iii) Measurement of dynamic contact angle inside square<br />

capillary tubes<br />

iv) Realisation of an experimental bench <strong>for</strong> visualisation of<br />

one vapour plug and one liquid slug and first experiments<br />

Research papers published: One<br />

Project 4408-1<br />

THERMO HYDRODYNAMICS OF PHASE CHANGE INDUCED<br />

OSCILLATING TAYLOR BUBBLE FLOWS<br />

Research Activities 2010-11<br />

Material Sciences<br />

Dr. Sameer Khandekar<br />

Department of Mechanical Engineering<br />

Indian Institute of Technology<br />

Kanpur<br />

Prof. Jocelyn Bonjour<br />

Centre de Thermique de Lyon<br />

(CETHIL)<br />

INSA-Lyon<br />

Villeurbanne<br />

Experimental bench of the single-bubble PHP at INSA-Lyon (V)<br />

79

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