Details of Grant 

EPSRC Reference:	GR/L85053/01
Title:	JREI: DESIGN AND OPERABILITY OF LOW PRESSURE THERMOSYPHON REBOILERS
Principal Investigator:	Webb, Dr D
Other Investigators:	Hewitt, Professor GF Heggs, Professor P
Researcher Co-Investigators:
Project Partners:	Heat Transfer & Fluid Flow SVC Pre Nexus Migration
Department:	Chemical Engineering
Organisation:	UMIST
Scheme:	JREI
Starts:	01 July 1998	Ends:	30 June 2001	Value (£):	48,000
EPSRC Research Topic Classifications:	Design & Testing Technology Energy Efficiency Multiphase Flow
EPSRC Industrial Sector Classifications:	No relevance to Underpinning Sectors
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Summary on Grant Application Form
Despite the wide range of applications, boiling (and particularly boiling in flow or forced convection conditions) is still poorly understood. Whenever new applications arise which fall outside the existing data base, the predictive capability is inadequate to allow extrapolation to the new conditions. This is because flow boiling systems combine complex interfacial heat and mass transfer behaviour in addition to the normal complexities of tubulent flows. Operation of systens at sub-atmospheric pressure is often desirable to achieve higher thermodynamic effiency, reduced energy consumption, better separations, and lower temperatures to allow processing of heat sensitive materials and cheaper materials of construction. The proposal relates tothe provision of semi-industrial scale equipment to investigate the limits of operation of thermosyphon reboilers at reduced pressure. In addition the performance of such reboilers will be measured over a wide operating range to provide data for validation of design methods. In particular the project will concentrate on the effect of mixture boiling and stability. Further, design methods will be developed for reboilers operating at sub-atmospheric pressure including mixrture effects. Within an associated project, measurements will be made on a single tube to complement the bundle measurements of the study proposed here and a new, non-linear treatment of stability will be developed. The new data will be applied in the validation of design and stability calculation procedures.
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