Ayodeji A. Jeje
Professor of Chemical Engineering
P.Eng.
Associate Dean (Teaching & Learning)
- Associate Head Undergraduate Studies
- Room: EN D204A
- Telephone: (403) 220-5753
- Fax: (403) 282-3945
- E-mail: jeje@ucalgary.ca
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- B.Sc. (Purdue U., W. Lafayette, Indiana) 1969
- S.M. (Mass. Inst. Tech., Cambridge) 1970
- Ph.D. (Mass. Inst. Tech., Cambridge) 1974
DR JEJE'S principal research areas are heat/mass transfer and fluid mechanics. Fundamental principles are being applied, using analytic and numerical tools, to industrial problems, modelling of physical phenomena and investigating the relationship between form and function in physiological (mammalian and plant) systems.
Industrial problems. The emphasis has been on problems involving phase transformations (melting, condensation and boiling) which include simultaneous free-forced motion of a fluid and heat exchange. Applications have included the melting of sulphur and other contact-melting operations; and direct-contact heat transfer between fluids such as cryogenic liquids-warm water and steam-subcooled liquids/suspensions. The systems often exhibit hydrodynamic instability. Free surfaces are also present. Other problems include the formation of bubbles at submerged orifices in contacting devices; dissolution of carbon dioxide in hydrocarbon liquids at high pressures; and measurement of interfacial properties using laser light-scatter spectrocopy.
Modelling studies. The flow of fluids through pipes which are internally corrugated and the dynamics of pulsed laminar and turbulent jets in water are being investigated through experimentation and analysis. It has been observed that flow resistance may be reduced through modification of the micro-structures on surfaces over which a fluid flows. The potential value of the work includes energy savings in pumping valuable commodities of commerce such as hydrocarbon fluids over long distances. The dynamics of jets are also being studied because of the commercial applications for mixing and dispersal of one fluid phase in another.
Physiological systems. The areas of research are of three types - the flow of blood through the mammalian circulatory system, particularly through the aortic valves and the capillary network; the ascent of sap through the xylem of living plants in the swelling anisotropic porous media; and thermal regulation of the mammalian body. The effort is interdisciplinary and it involved not only a consideration of the mechanical forces but also the electrical fields and the structural forms.