An Instability Effect on Two-phase Heat Transfer for Subcooled Water Flowing Under Conditions of Zero Gravity

Download or read book An Instability Effect on Two-phase Heat Transfer for Subcooled Water Flowing Under Conditions of Zero Gravity written by S. Stephen Papell and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Subcritical, subcooled boiling heat-transfer data were obtained for distilled water flowing through a resistance-heated tube in a gravity-free environment lasting approximately 15 seconds. Two types of flow models were found to exist under identical test conditions. An instability initiated by a momentary interruption of flow forced the transition from a highly subcooled bubbly flow to a postulated slug flow that resulted in a 16-percent increase in local heat-transfer coefficients. The slug-flow regime was described as consisting of two phases in a highly nonequilibrium thermodynamic state. A duplication of test conditions that produced the transition in a zero-gravity environment failed to do so under Earth-gravity conditions.