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R. Kumar and N.R. Kuloor Studies in Bubble Formation I IV.pdf


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Contents
RESULTS OBTAINED . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.1 Effect of gas flow rate . . . . . . . . . . . . . . . . . . . . .
3.5.2 Effect of orifice submergence . . . . . . . . . . . . . . . . .
3.5.3 Effect of chamber volume . . . . . . . . . . . . . . . . . . .
3.5.4 Qualitative discussion of the phenomenon . . . . . . . . .
3.5.5 Nature of variation of the chamber pressure . . . . . . . .
CALCULATION OF BUBBLE VOLUME AND VERIFICATION
OF THE MODEL . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.1 Rigorous method . . . . . . . . . . . . . . . . . . . . . . . .
APPROXIMATE ITERATIVE METHOD TO EVALUATE THE
BUBBLE VOLUME FOR A GIVEN AVERAGE FLOW RATE . . .
3.7.1 Verification of the iterative procedure . . . . . . . . . . . .
3.7.2 Transition from intermediate region to constant flow or
constant pressure conditions . . . . . . . . . . . . . . . . .
3.7.3 Weeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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4 Studies in bubble formation IV. Bubble formation at porous discs
4.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 THE PRESENT MODEL . . . . . . . . . . . . . . . . . . . . . . . .
4.3 METHOD OF CALCULATION . . . . . . . . . . . . . . . . . . . .
4.4 VERIFICATION OF THE MODEL . . . . . . . . . . . . . . . . . .
4.5 EXPERIMENTAL SET-UP . . . . . . . . . . . . . . . . . . . . . . .
4.6 RESULTS AND DISCUSSION . . . . . . . . . . . . . . . . . . . . .
4.6.1 Influence of the average pore size on bubble volume . . .
4.6.2 Influence of surface tension of the liquid . . . . . . . . . .
4.6.3 Influence of viscosity of the liquid . . . . . . . . . . . . . .
4.6.4 Comparison of the experimental data from an operative
site on the disc with the theory of bubble formation from
isolated nozzles . . . . . . . . . . . . . . . . . . . . . . . . .
4.7 NOTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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References

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3.5

3.6

3.7

3.8

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