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University of New Hampshire University of New Hampshire Scholars' Repository Doctoral Dissertations Student Scholarship Spring 1988 Experimental study of simulated micro-gravity vapor-liquid flow regimes S B Reddy Karri University of New Hampshire, Durham Follow this and additional works at: https://scholars.unh.edu/dissertation Recommended Citation Karri, S B Reddy, "Experimental study of simulated micro-gravity vapor-liquid flow regimes" (1988). Doctoral Dissertations. 1537. https://scholars.unh.edu/dissertation/1537 This Dissertation is brought to you for free and open access by the Student Scholarship at University of New Hampshire Scholars' Repository. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of University of New Hampshire Scholars' Repository. For more information, please contact [email protected]. INFORMATION TO USERS The most advanced technology has been used to photo­ graph and reproduce this manuscript from the microfilm master. UMI films the original text directly from the copy submitted. Thus, some dissertation copies are in typewriter face, while others may be from a computer printer. In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyrighted material had to be removed, a note will indicate the deletion. Oversize materials (e.g., maps, drawings, charts) are re­ produced by sectioning the original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overlaps. Each oversize page is available as one exposure on a standard 35 mm slide or as a 17" x 23" black and white photographic print for an additional charge. Photographs included in the original m anuscript have been reproduced xerographically in this copy. 35 mm slides or 6" x 9" black and white photographic prints are available for any photographs or illustrations appearing in this copy for an additional charge. Contact UMI directly to order. Accessing the World's Information since 1938 300 North Zeeb Road. Ann Arbor. Ml 48106-1346 USA Order Number 8816692 Experimental study of simulated micro-gravity vapor-liquid flow regim es Karri, S. B. Reddy, Ph.D. University of New Hampshire, 1988 UMI 300 N. Zeeb Rd. Ann Arbor, MI 48106 PLEASE NOTE: In all cases this material has been filmed in the best possible way from the available copy. Problems encountered with this document have been identified here with a check mark V . 1. Glossy photographs or pages _____ 2. Colored illustrations, paper or print ______ 3. Photographs with dark background _____ 4. Illustrations are poor copy ______ 5. Pages with black marks, not original copy i / 6. Print shows through as there is text on both sides of p a g e _______ 7. Indistinct, broken or small print on several pages 8. Print exceeds margin requirements ______ 9. Tightly bound copy with print lost in spine _______ 10. Computer printout pages with indistinct print ______ 11. Page(s)____________ lacking when material received, and not available from school or author. 12. Page(s)____________ seem to be missing in numbering only as text follows. 13. Two pages numbered _______ . Text follows. 14. Curling and wrinkled pages ___ 15. Dissertation contains pages with print at a slant, filmed a s received 16. Other _______________________________________________________________________ UMI SSPSSZKOfTAL STOTT OF STWJLAIKD MZCBO-CBAFITr ▼APOK-Lzqtrxs f l o w b k g z h s s *7 S.S. Baddy K arri B.Tach.. Andhra TTnivarsity, 1981 M.S., Onivarsity of Ha» Baapshire, 1984 DISSERTATION Subaittad co tha University of Haw Baapshira in Partial Fulfillaant of tha Raquireaants for tha Oagraa of Doctor of Philosophy in Bogin a«ring M ay. 1988 This dissertation has been examined and approved. V t ) '*'C* AT . / V ____________________ Dissertation director, Virendra K. Mathur, Professor of Chemical Engineering S T _________________ Stephen §LT. Fan, Chairman and Professor of Chemical Engineering ■ 'iP ’ p r „r Russell T. Carr, Assistant Professor of Chemical Engineering Horst J. Richter, Professor of Engineering, Dartmouth College Jtfjud A. W ilson, Associate Professor of Mechanical Engineering DEDICATION To My Parents, whose love and sacrifice make everything possible. ACKNOWLEDGEMENTS I am greatful to my dissertation director, Professor V.K. Mathur, for his valuable guidance, openness, and encouragement in directing the work that is presented in this thesis. I am fortunate to have had the benefit of his experience and confidence. I thank my thesis committee members, Professors S.S.T. Fan, R.T. Carr of the Chemical Engineering Department, J.A. Wilson of Mechanical Engineering, and HJ. Richter of Dartmouth College who read the draft of the thesis, made constructive criticisms, and offered many invaluable suggestions for improvement. I also thank Mr. Kenneth Palmer for his creativity relating to mechanical matters. In performing the experiments I received generous assistance from my friend, Mathew Miller. Stimulating conversations, which helped to determine the topical coverage, were held with Mr. Tom Lovell. Lastly, thanks are also due to all others who have contributed to the successful completion of this study. I acknowledge the AETA Corporation, Portsmouth, New Hampshire; and US Air Force, Wright-Patterson Air Force Base, Dayton, Ohio, for providing funds for this project. Finally, I acknowledge the ever present support and encouragement by my uncle and aunt. SLR. Reddy Karri TABLE OF CONTENTS DEDICATION............................................................ iii ACKNOWLEDGEMENTS................................................... iv LIST OF TABLES....................................................... viii LIST OF FIGURES ................................................... ix NOMENCLATURE.......................................................... xii ABSTRACT............................................................ xv CHAPTER PAGE I. INTRODUCTION............................................... 1 II. LITERATURE SURVEY ........................................ 10 a. Drop Tower Tests ...................... 10 b. Aircraft Tests ............................. 12 c. Rocket Tests ........................................ 14 d. Shuttle Tests. ............................... 14 e. Magnetic Field Tests ............................... 15 III. DYNAMICS OF BUBBLE DEPARTURE IN MICRO-GRAVITY .......... 16 Theory........................ .......................... 17 Results and Discussion................................. 22 Conclusions ............................................ 29 IV. TWO-PHASE (VAPOR-LIQUID) FLOW PATTERNS.................. 30 Flow Regime Map Analysis............................ 30 Forces Acting on a Vapor-Liquid Flow................... 32 Micro-g Vapor-Liquid Flow .......................... 34 V. VAPOR-LIQUID (TWO-PHASE) FLOW REGIME MAP PREDICTIONS V UNDER MICRO-GRAVITY ...................................... 40 Analytical Approach to Transitions.................... 40 Results and Discussion........... 48 Conclusions and Significance...................... 58 VI, SCIENTIFIC RATIONALE FOR THE TECHNIQUE OF SIMULATING MICRO-GRAVITY VAPOR-LIQUID FLOW ........................ 59 Steady-Flow, Micro-g Vapor-Liquid Simulation. .... 61 VII. EXPERIMENTAL SET-UP AND PROCEDURE ....................... 63 Visualization Section ............. 65 Separation T a n k ........................................ 65 Measurement of Physical Properties......... 66 VIII. MEASUREMENT OF INTERFACIAL TENSION OF IMMISCIBLE LIQUIDS OF EQUAL DENSITY................................. 68 Theory. ..... ............................... ... 69 Apparatus and Measurement ............................. 73 Experimental Results................................... 73 IX. SELECTION OF ENTRACE CONFIGURATION AND CRITERIA FOR EXPERIMENTAL PARAMETERS ................................. 77 Entrace Effects ........................ ............... 77 Flow Regime Map - Fluid System # 1 .................... 85 Selection of Fluid Systems................. 91 X. RESULTS AND DISCUSSION.................................... 99 Section A. Simulated Micro-g Flow Regime Maps .... 99 Section B. Comparison of Simulated vs. Actual Micro-g Vapor-Liquid Flow Regime D a t a .............. 124 XI. C O N C L U S I O N S ................................................. 133 XII. RECOMMENDATIONS ........................................... 135 vi LIST OF REFERENCES......................................................................................................................138 APPENDIX A ............................................................ 143 APPENDIX B ............................................................ 156 APPENDIX C ............................................................ 162 APPENDIX D ................................................ 167 vii LIST OF TABLES N O . PAGE 3.1 Bubble Departure Radius : Comparison of Experimental and Predicted Data................... 23 4.1 Coordinate Systems Used for Flow Regime Maps of Two-Phase Flow in both Horizontal and Vertical Flows. 32 4.2 Flow Regime Definitions of Two-Phase Flow in Simulated Micro-g ............ ........ 38 8.1 Interfacial Tension of Various Systems of Unequal Density at 2 5 ° C ................................. 74 8.2 Interfacial Tension of Various Systems of Equal Density at 2 5 ° C ......................................... 75 9.1 Entrace Effects : Flow Regime Data. .................... 82 9.2 Physical Properties of Equi-Density

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