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Details of Grant 

EPSRC Reference: EP/M018261/1
Title: Indo - UK: Premature, Oscillation-Induced Critical Heat Flux ("Premature OICHF")
Principal Investigator: Walker, Dr S
Other Investigators:
Bluck, Dr MJ Issa, Dr R Hewitt, Professor GF
Researcher Co-Investigators:
Project Partners:
Department: Mechanical Engineering
Organisation: Imperial College London
Scheme: Standard Research - NR1
Starts: 01 December 2015 Ends: 30 November 2018 Value (£): 112,729
EPSRC Research Topic Classifications:
Energy - Nuclear
EPSRC Industrial Sector Classifications:
Energy
Related Grants:
Panel History:
Panel DatePanel NameOutcome
28 Jan 2015 UK India Civil Nuclear Energy 3 Announced
Summary on Grant Application Form
Water is an excellent coolant for nuclear reactors, but steam is a very poor one. The ability to predict with confidence, but without excessive conservatism, the point at which cooling by water will turn into cooling by just steam is absolutely vital. The the rate of transfer of heat at which this transition occurs is known as the "critical heat flux" (CHF).

Predicting the circumstances under which CHF would occur (and then making sure that reactor operating conditions stay well away from them) is a very large part of the thermal hydraulic design of water cooled reactors.

There are some, unusual, circumstances in which the flows inside a nuclear reactor can become unsteady and cyclical, with flow-rates rising and falling with time. Under the circumstances, predicting the critical heat flux not surprisingly becomes rather more complicated and difficult.

This project is attempting to build a computer model which will predict when critical heat flux occurs in the presence of cyclical flows. The second strand of this project is to conduct experiments in which a test section is exposed to a cyclical flow, and the occurrence or not of critical heat flux is observed. The model we develop will then be tested and refined against these measurements.

A validated, general-purpose tool for predicting critical heat flux under conditions of oscillatory flow will be a useful additional capability available to reactor designers and safety analysts.
Key Findings
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Organisation Website: http://www.imperial.ac.uk