David W. Johnson & John L. Woodward 
RELEASE 
A Model with Data to Predict Aerosol Rainout in Accidental Releases

This book documents CCPS’s Aerosol Research Program to develop a model to predict liquid rainout from release of a pressurized, liquefied gas–and, hence the residual amount of material in a vapor cloud, which may be greater than the amount calculated from an enthalpy chart. RELEASE predicts the rate of fluid discharge, the depressurization, flashing and formation of liquid drops, the entrainment of drops into the vapor cloud, the subsequent spreading of the jet, and rate of liquid rainout to a pool on the ground. Designed in a modular fashion to permit adjustment and corrections as new data become available, its multi-layered approach contains sub-models that include the complexities of many variables, including the effect of liquid superheat, rate of bubble growth, criterion for bubble formation, and heat transfer from the liquid to the growing vapor bubble. To validate RELEASE, CCPS conducted small- and large-scale experiments using superheated water, heated liquefied chlorine, methylamine, and cyclohexane that produced valuable data in an area where data are scarce. This book gives complete access, in text and on CD-ROM, to the model and the test data, giving users an informed ability to apply the model to their own work.

Table of Content

Preface.

Acknowledgments.

About This Book.

PART I. DESIGN AND RESULTS OF CCPS AEROSOL FIELD
TESTS
.

1. Introduction.

2. Chronological History.

3. Development of the Release Model.

4. Oklahoma Experimental Program (Water and CFC-11).

5. Nevada Experimental Program (Chlorine, Methylamine, and
Cyclohexane).

6. Corrections to Experimental Data and Further Release Model
Work.

7. Summary and Future Work.

References.

PART II. MEASUREMENT AND MODELING OF ACCIDENTAL AEROSOL
RELEASES.

8. Background and Objectives.

9. Correcting Experimental Rainout Data.

10. The RELEASE Model for Predicting Rainout.

11. Aerosol Drop Size Correlation.

Appendix A. Experimental rainout Data.

Appendix B. Solar Radiation Data for Las Vegas, NV.

Appendix C. Theory of Mode Used to Correct Rainout Data.

Appendix D. Additional Modeling Details.

Appendix E. Rainout Correlation Using Adiabatic Saturation
Temperature.

References.

Nomenclature.

Index.

About the author

David W. Johnson is the author of RELEASE: A Model with Data to Predict Aerosol Rainout in Accidental Releases, published by Wiley.

John L. Woodward is the author of RELEASE: A Model with Data to Predict Aerosol Rainout in Accidental Releases, published by Wiley.