Sheldon Green

Sheldon Green

Sheldon Green

Professor

P.Eng., B.A.Sc. (University of Toronto), M.A.Sc., Ph.D. (Caltech), FASME, FCAE, Member TAPPI

phone: (604) 822-0497
fax: (604) 822-2403
email: green@mech.ubc.ca
website:  Applied Fluid Mechanics Laboratory
office: CEME 2058

Research Interests

  • Industrial fluid mechanics
  • Liquid friction modifier application to surfaces
  • Electrospraying onto a moving surface
  • Paper creping
  • Paper pressing
  • Energy recovery ventilators

Current Research Work

Friction modifier is a product applied to railroad wheels or rails to maintain the friction between the wheel and the rail at an optimal level. Too low a coefficient of friction can cause derailment or the inability to climb a slope, and too high a coefficient results in excessive fuel consumption and track wear and noise. In collaboration with the multinational company LB Foster, we study, experimentally and analytically, the efficient application of liquid friction modifier to railroad tracks or wheels. We have also begun to explore the feasibility of using electrospraying to coat railroad tracks from a moving train. Academic collaborators for these projects are Professors Boris Stoeber and Neil Balmforth.

Creping is the process that is used to generate toilet paper, paper towel, and other important consumer products from a paper sheet. The quality of the creping process affects the softness, strength, and absorbency of the creped paper. Professor Srikantha Phani and I are collaborating with a consortium of four companies (FP Innovations, Kruger Products, Solenis, and Albany) to understand paper creping, using a combination of analytical and experimental methods.

In a paper machine, the pulp mat leaving the forming section is about 80% water by weight. To reduce the energy consumed in the drying section, and to improve the paper consolidation, the paper is pressed before drying. We carry out unique experiments to understand paper pressing mechanics (industrial collaborator: AstenJohnson; academic collaborator: Professor Boris Stoeber).

Professor Steven Rogak and I are collaborating with Core Energy Recovery Solutions to understand the complex heat and mass transfer processes in energy recovery ventilators. This research combines experimental techniques and analysis.

Selected Publications

  • Roberts, J.J. and Green, S.I., “Experimental Study of Locomotive Sanding”, accepted for publication in Proceedings of the IMECH E Part J: Journal of Rail and Rapid Transit, February 2020.
  • Pan, K., Phani, A.S., and Green, S.I., “Periodic Folding of a Falling Viscoelastic Sheet”, accepted for publication in Physical Review E, Dec. 2019.
  • Gautam, A. and Green, S.I., “Computational fluid dynamics-discrete element method simulation of locomotive sanders”, Proceedings of the IMECH E Part J: Journal of Rail and Rapid Transit, December 2019. https://doi.org/10.1177/0954409720902897
  • Sylvester, A., Engarnevis, A., D. Kadylak, Huizing, R., Rogak, S., and Green, S.I. “Numerical and experimental analysis of forced convection in rib-roughened channels with moisture-permeable walls”, AIChE Journal, 2020;66:e16801, September 2019. https://doi.org/10.1002/aic.16801
  • Pan, K., Das. R., Phani, S., and Green, S., “An elastoplastic creping model for tissue manufacturing”, International Journal of Solids and Structures, 165, pp. 23-33, 2019.
  • Al Qurooni, F., Vakil, A., Elsaadawy, E., and Green, S., “Numerical simulation of an over-expanded supersonic and subsonic industrial nozzle flow relevant to flaring system”, Transactions of the Canadian Society for Mechanical Engineering, 43(3), pp. 471-480, 2019.
  • Barimani, M., Green, S.I., and Rogak, S., “Particulate concentration distribution in centrifugal air classifiers”, Minerals Engineering, 126, pp. 44-51, 2018.
  • Engarnevis, A., Huizing, R., Green, S., and Rogak, S., “Heat and mass transfer modeling in enthalpy exchangers using asymmetric composite membranes”, Journal of Membrane Science, 556, pp. 248-262, 2018.
  • Pan, K., Green, S.I., and Phani, S., “Particle dynamics modeling of the creping process in tissue making”, ASME Journal of Manufacturing Science and Engineering, 140(7), pp. 071003-1-10, 2018.
  • Engarnevis, A., Huizing, R., Green, S. & Rogak, S. “Particulate fouling assessment in membrane based air-to-air energy exchangers”, Energy and Buildings, 150, pp. 477–487, 2017.
  • Ho, A., Affoo, R., Rogus-Pulia, N., Nicosia,M., Inamoto, Y., Saitoh, E., Green, S., Fels, S., “Inferring the effects of saliva on liquid bolus flow using computer simulation”, Computers in Biology and Medicine, 89, pp. 304-313, October 2017.
  • Rahmani, H. and Green, S.I., “Particle-laden liquid jet impingement on a moving substrate”, AIChE Journal, 63(10), pp. 4673-4684, 2017.
  • Forughi, A.F., Stoeber, B., and Green, S.I., “Transparency measurement of thin films with one-sided optical access using fluorescence imaging”, Applied Optics, 56(12), pp. 3359-3364, 2017.
  • Hao, J. and Green, S.I., “Splash threshold of a droplet impacting a moving substrate”, Physics of Fluids, 29, 012103, pp. 1-8, 2017. doi: 10.1063/1.4972976.

more >>