Experimental investigation of heat transfer in the transition region
An experimental study of forced convective boiling heat transfer for upflow of water in a circular tube was performed using a heat transfer system with temperature-controlled indirect Joule heating. Complete boiling curves from incipience of boiling to fully established film boiling were measured, including the transition boiling regime. Most of the results covered the pressure range from 0.1 to 1.0 MPa, mass flux range from 25 to 200 kg/(m2s) and inlet subcooling from 5 to 30 K. The experimental results of transition boiling heat transfer obtained in the centre of the test section were correlated in terms of a heat flux/surface superheat relationship that was normalised by the maximum heat flux (local CHF) and its associated wall superheat, respectively, to anchor the transition boiling curve to its low temperature limit. The upper surface temperature limit of the transition boiling regime was determined by inspection of measured axial distributions of surface heat flux and corresponding wall temperature. The critical heat flux (CHF) and its corresponding wall superheat were also measured. The data for the critical wall superheat showed a clear dependence upon pressure, mass flux and inlet quality.
Bibliographic Reference: EUR 13235 EN (1990) 176 pp., FS, ECU 13.75
ISBN: ISBN 92-826-1986-9
Record Number: 199110480 / Last updated on: 1994-12-02
Original language: en
Available languages: en