Ali El Wahid

Dr Ali El Wahed

Senior Lecturer in Mechanical Engineering

Profile

Dr Ali El Wahed is currently the Head of the Division of Mechanical and Electronic Engineering at the University of Dundee. He was awarded the PhD degree in Mechanical Engineering by the University of Liverpool in 1991. He has been active in various areas of research, especially in smart materials, applied electrostatics and fluid flowmetering. He has collaborated with world-class companies such as Ford Motor Company on the design and modelling of novel smart fluid devices in addition to his work on electrostatic spraying systems in collaboration with Kellogg’s and Jacobs Bakery. He is on the Editorial Board of the Journal of Advances in Mechanical Engineering.

 

Research

Dr El Wahed has gained an international recognition for his work in applying electrorheological (ER) and magnetorheological (MR) fluids to a wide range of mechanical devices, as well as in the modelling of their rheological characteristics. His early work on ER fluids in squeeze, which was carried out at the University of Liverpool in collaboration with Nippon Shokubai Co (Japan) and Bayer AG (Germany), has confirmed the existence of an enhanced yield stress over that measured in simple shear mode. He has conducted systematic studies to understand the characteristics of ER and MR fluids under shear, flow, squeeze and mixed modes. In addition, his smart fluid modelling studies have resulted in the development of interactive procedures for designing novel smart actuators for different types of engineering applications. Recently, Dr El Wahed completed a research project on the comparative assessment of the performance of ER and MR devices under impulsive loads. In a similar area, work with Ford Motor Company identified the possibility of using an ER fluid-based clutch mechanism instead of a magnetic coupling on a conventional automotive air-conditioning system so as to permit a continuously variable torque input to the compressor according to variation in the ambient air temperature. His recent work has focused on the application of MR fluids to engine mounts in collaboration with Jaguar, JCB and Lord Corporation. In addition, he is now utilising the smart fluid technology, in collaboration with researchers at Loughborough University and the Institute for Medical Science and Technology (IMSaT) into biomedical applications, particularly in devices for physiotherapy and laparoscopy.

Dr El Wahed has been working closely with the industry and managed to find solutions to real engineering problems. For example, he collaborated with Kellogg's and Jacobs Bakery on the optimum design of electrostatic systems for spraying vitamin and marmalade solutions onto their food products. He also helped several UK companies, including Stakehill International, Empire Engineering and Prochem Services with their pressure-relief valves design and testing. In addition, he has carried out computational fluid dynamic simulations and model testing of civil structures, such as the Lowry foot bridge, Salford (Parkman Co) and the King's Waterfront Complex, Liverpool (Bingham Cotterell/Stadium Group Ltd).

Publications

Sproston, J. L., El Wahed, A. K. and Johnson, M. W., “An electrostatic vortex shedding meter”, Flow Measurements and Instrumentation, Vol. 1, No. 4, pp. 183-190, 1990. ISSN: 09555986

El Wahed, A. K. and Sproston, J. L., “The influence of shedder shape on the performance of the electrostatic vortex flowmeter”, Flow Measurements and Instrumentation, Vol. 2, pp. 169-179, July 1991. ISSN: 09555986

El Wahed, A. K., Johnson, M. W. and Sproston, J. L., “Numerical study of vortex shedding from different shaped bluff bodies”, Flow Measurements and Instrumentation, Vol. 4, No. 4, pp. 233-240, 1993. ISSN: 09555986

El Wahed, A. K., Sproston, J. L., Williams, W. and Stanway, R., “A vibration damper using electrorheological fluids in squeeze; Experimental validation of theoretical models”, ASME, FED, Vol. 235, pp. 1-13, 1995. CODEN: FEDSD

Sproston, J. L., El Wahed, A. K., Williams, W. and Stanway, R., “A comparison of the performance of ER Fluids in squeeze”, International Journal of Modern Physics B, Vol. 10, Nos. 23 & 24, pp. 3081-3091, 1996. ISSN: 1045-389X

El Wahed, A. K., Sproston, J. L. and Stanway, R., “The response of an electrorheological fluid to step change in applied voltage in dynamic squeeze flow”, ASME, AMD, Vol. 217, pp. 277-286, 1996. ISSN: 01608835

Stanway, R., Sproston, J. L. and El Wahed, A. K., “Applications of ER Fluids in vibration control: A survey”, Smart Materials and Structures, Vol. 5, No. 4, pp. 464-482, August 1996. ISSN: 09641726

Sproston, J. L., El Wahed, A. K. and Stanway, R., “Electrorheological fluids under AC and DC excitation and the influence of solid phase size”, ASME, FED, Vol. 243, pp. 207-220, 1997. ISSN: 08888116

El Wahed, A. K., Sproston, J. L. and Stanway, R., “The performance of an electrorheological fluid in dynamic squeeze flow under constant voltage and constant field”, J. Physics D: Applied Physics, Vol. 31, no. 20, pp. 2964-2974, 1998. ISSN: 0022-3727

El Wahed, A. K., Sproston, J. L. and Schleyer, G. K., “Electrorheological fluids applied to impulsive loads”, ASME, FED, Vol. 246, pp. 159-165, 1998. ISSN: 08888116