John Christy

Research Themes: 

Research Interests

  • Biomedical Fluid Mechanics
    Recent advances in polyurethane heart-valve technology and in bileaflet valve designs along with reported failures in the ability of animal trials to identify potential incidence of thrombosis have led to renewed interest in alternative means of pre-clinical testing of heart valves. Successful development of an ultrasonic imaging technique coupled with our milk-based in-vitro thrombogenicity assessment procedure (the only blood-free thrombogenicity assessment procedure world-wide) offer the scope for real-time analysis of clot deposition. This along with velocimetry studies using the complementary techniques of PIV and LDV will offer valve developers new means of pre-clinical evaluation of valves. Currently a wide range of valves are being tested with our milk clotting test to confirm the degree to which this test matches thrombosis in-vivo. This work is to be supplemented by micro-analysis of milk clot and thrombus to determine the relationship between structural aspects of clot deposition and flow phenomena. The availability of cryogenic microscopy facilities in the Division of Biology make Edinburgh the ideal location for this research. Advances in applying PIV to micro-scale systems in conjunction with Physics (Greated) offers scope for combined PIV/LDV studies of flow in the hinge pockets of tilting disc valves (eg St. Jude Medical Valve) to evaluate the accuracy of current techniques for predicting turbulent shear stresses. This is important in valve development because high shear is associated with thrombus formation.
  • Microelectronics Cooling
    In collaboration with Khellil Sefiane work is beginning in the area of microelectronics cooling. Cooling techniques based on evaporation of a liquid coolant are influenced by the physics of the liquid-vapour-solid interactions at the hot surface. High speed flow visualisation and measurement of the highly transient flows offers the scope for characterisation of these interactions.

Last modified: 

20/12/2013 - 11:15
John Christy
John Christy

Academic Title: 

Senior Lecturer

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