Library Subscription: Guest
International Symposium on Multiphase Flow and Transport Phenomena
November, 5-10, 2000, Antalya, Turkey

DOI: 10.1615/ICHMT.1997.IntSymLiqTwoPhaseFlowTranspPhen


ISBN Print: 1-56700-162-9

ON THE WAVE CHARACTER OF DEVELOPMENT OF BUBBLE BOILING IN CHANNEL FLOW

page 8
Get accessGet access

ABSTRACT

The paper describes results of experimental investigations into the development of bubble boiling in a tubular channel. The investigations extend on the early stage of boiling in a single-phase medium where first bubbles of vapour appear, as well as on the stage of two-phase flow where boiling in the flow core is replaced by surface boiling. For some favourable conditions, the so-called boiling front forms near the exit from the channel, that is at a location of the maximum liquid superheat. The boiling front propagates then upstream with a velocity vp that depends on a number of parameters, including void fraction ε, pressure drop Δр, and heat flux density q at the channel wall. The presented results of measurements exhibit the wave character of development of bubble boiling in channel flow. The experimental investigations are carried out with the help of a computer-aided measuring apparatus operating with a system detectors and electronic transducers of physical quantities describing the process of boiling. A new environment-friendly refrigerants R134a and R123 are used in the course of investigations.

Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections Prices and Subscription Policies Begell House Contact Us Language English 中文 Русский Português German French Spain