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Dr. WONG, P.L., Patrick

BSc-MechE(CityULondon), PhD(HKU)

Associate Professor

Contact Information

Office: YEUNG-B6621
Phone: +(852)-3442-8427
Email: meplwong@cityu.edu.hk

Research Interests

  • Tribology
  • Rolling element bearings
  • Interfacial slippage
  • Contact mechanics

Main Research Activities

  1. Tribology
    • Actively involved in Tribology research for over thirty years.
    • Developed an efficient and robust technique for the measurement of a wide lubricating film thickness range from micro to nanometers.
    • Currently studying on lubrication system with film thickness ranging from micro to nano scales.
  2. Rolling element bearings
    • Life of rolling ball bearings in contaminated conditions through tailored experiment, microscopy and finite-element modeling.
    • New lubrication mechanism for bearings running under zero entrainment condition.
    • Invented a new retainerless rolling element bearing type.
  3. Interfacial slippage
    • Successfully developed a novel lubrication means to facilitate effective lubrication of parallel faces – a common feature in micro/nano systems based on the principle of interfacial slippage between the fluid and solid surfaces.
  4. Contact mechanics
    • Invented a new algorithm to solve 3D contact problems, enabling the solutions of any wedge, not only restricted to wedge angle of half-space) or quarter-space.
    • Developed an efficient and explicit method to obtain the surface deformation of quarter-space under normal load.

Selected Recent Publications

  • Guo L., Zhang Z.M., Wang W., Zhao Y. and Wong P.L., “An explicit solution to a three-dimensional wedge problem considering two edges effect”, Friction, DOI:10.1007/s40544-019-0265-7, April 2019.
  • Zhao Y., Wong P.L. and Mao J.H., “Solving coupled boundary slip and heat transfer EHL problem under large slide–roll ratio conditions”, Tribology International, Vol. 133, pp.73-87, 2019.
  • Liu C.L., Guo F. and Wong P.L., “Characterisation of starved hydrodynamic lubricating films”, Tribology International, Vol. 131, pp.694-701, 2019.
  • Wong P.L., Zhao Y. and Mao J., “Facilitating effective hydrodynamic lubrication for zero-entrainment velocity contacts based on boundary slip mechanism”, Tribology International, Vo. 128, 89-95, Jul. 2018.
  • Guo F., Zang S., Li C., Wong P.L. and Guo L., “Lubrication film generation in slider-on-disc contact under limited lubricant supply”, Tribology International, Vol. 125, pp.200-208, 2018.
  • Zhao Y., Wong P.L., and Mao J.H., “EHL film formation under zero entrainment velocity condition”, Tribology International, Vol. 124, pp.1-9, Mar. 2018.
  • Guo L., Wong P.L. and Gachot C., “Facilitating the study of the texturing effect on hydrodynamic lubrication”, Lubricants, 6, 1, Mar. 2018.
  • Li X.M., Guo F., Wong P.L. and Zhao Y., “Regulation of lubricant supply by wettability gradient in rolling EHL contacts”, Tribology International, Vol. 120, pp.565-574, Apr. 2018.
  • Bai Q., Guo F., Wong P.L. and Jiang P., “Online Measurement of Lubricating Film Thickness in Slider-on-Disc Contact Based on Dichromatic Optical Interferometry”, Tribol. Lett., 65, 145, 10 pages, Oct., 2017.
  • Guo L., Zhang Z.M., Wang W. and Wong P.L., “An explicit matrix algorithm for solving three-dimensional elastic wedge under surface loads”, International Journal of Solids and Structures, Vol.128, pp.231-242,2017.
  • Guo L., Wang W., Zhang Z.M., and Wong P.L., “Study on the free edge effect on finite line contact elastohydrodynamic lubrication”, Tribology International, Vol., 116, pp.482-490, Aug. 2017. DOI:10.1016/j.triboint.2017.08.010
  • Liu H.C., Guo F., Wong P.L. and Li X., “Investigation of adsorbed protein and passive films on hydrodynamic lubricated steel slider surface”, Tribology International, Vol. 109, pp. 133-139, May 2017.
  • Wang W., Guo L., Wong P.L. and Zhang Z.M., “Surface normal deformation in elastic quarter-space”, Tribology International, Vol. 114, pp.358-364, Oct. 2017.
  • Guo L, Wong P.L. and Guo F., “Identifying the optimal interfacial parameter correlated with hydrodynamic lubrication”, Friction, Dec. 2016, 4(4), 347-358.
  • Guo L., Wong P.L. and Guo F., “Effects of viscosity and sliding speed on boundary slippage in thin film hydrodynamic lubrication”, Tribology International, Vol. 107, pp.85-93, 2017.
  • Guo L., Wong P.L. and Guo F., “Boundary yield stress and interfacial potential energy barrier in thin film hydrodynamic lubrication”, Tribology Letter, 62(1), pp.1-8, March 2016.
  • Liu H.C., Guo F., Zhang B.B. and Wong P.L., “Behaviour of hydrodynamic lubrication films under non-steady state speeds”, Tribology International, Vol. 93, Part A, pp.347-354, Jan 2016.
  • Li X., Guo F. and Wong P.L., “Effect of bovine serum albumin aqueous solution on steel slider surface under hydrodynamic lubrication”, presented at the 41st Leeds/Lyon Symposium on Tribology, Leeds, England, September 2014, and also Tribology International, Vol. 93, Part B, pp. 495-501, Jan. 2016.
  • Guo L., Wong P.L. and Guo F., “Correlation of contact angle hysteresis and hydrodynamic lubrication”, Tribology Letters, Vol. 58, 45, pp. 1-9, June 2015.
  • Liu H.C., Guo F., Guo L. and Wong P.L., “A dichromatic interference intensity modulation approach to measurement of lubricating film thickness”, Tribology Letters, Vol. 58:15, pp. 1-11, April 2015.
  • Fu Z., Wong P.L. and Guo F., “Localized boundary effect on elastohydrodynamic lubricated film shape”, Tribology Letters, Vol. 56, pp.471-479, Dec. 2014.
  • Guo L., Wong P.L., Guo F. and Liu H.C., “Determination of thin hydrodynamic lubricating film thickness using dichromatic interferometry”, Applied Optics, 53, 26, Sep. 2014.
  • Guo F., Yang S.Y., Ma C. and Wong P.L., “Experimental study on lubrication film thickness under different interface wettabilities”, Tribology Letters, Vol. 54, 1, pp.81-88, Apr. 2014.
  • Fu Z., Wong P.L. and Guo. F., “Effect of interfacial properties on EHL under pure sliding conditions”, Tribology Letters, Vol. 49, 1, pp.31-38, Jan. 2013.
  • Wong P.L., Li X.M. and Guo F., “Evidence of lubricant slip on steel surface in EHL contact”, Tribology International, Vol. 61, pp.116-119, May 2013.
  • Zhang Z.M., Wang W. and Wong P.L., “An explicit solution for the elastic quarter-space problem in matrix formulation”, International Journal of Solids and Structures, Vol. 50, 6, pp.976-980, Mar. 2013.
  • Li X.M, Guo F. and Wong P.L., “Shear rate and pressure effects on boundary slippage in highly stressed contacts”, presented at the 38th Leeds/Lyon Symposium on Tribology, Lyon, France, September 2011, and also Tribology International, Vol. 59, pp.147-153, Mar. 2013.
  • Li X., Guo F., Yang S. and Wong P.L., “Measurement of load-carrying capacity of thin lubricating films”, TRANS. ASME J. OF TRIBO., 134, 4, art. No.044501, 2012.
  • Lau H.Y., Liu K.P., Wong P.L. and Wang W., “A new design of smart journal bearing based on GMM actuators”, Industrial Lubrication and Tribology, Vol.64, Iss:3, pp.147-151, 2012.
  • Fu Z., Guo F. and Wong P.L., “Friction-speed characteristics of EHL contacts with anomalous film shapes”, Proceedings of the I MECH E Part J Journal of Engineering Tribology, 226, 2, 81-86, February 2012.
  • Chow T.C.S., Wong P.L. and Liu K.P., “Shape effect of magnetic source on stabilizing range of vertical diamagnetic levitation”, IEEE TRANS. MAGNETICS, 48, 1, art. no. 6034526, pp.26-30, 2012.
  • Li X.M, Guo F. and Wong P.L., “Study of boundary slippage using movement of a post-impact EHL dimple under conditions of pure sliding and zero entrainment velocity”, Tribology International, Vol.44, 2, pp.159-165, Nov. 2011.
  • Li X.M, Guo F. and Wong P.L., “Movement of entrapped oil under pure rolling conditions”, presented at International Tribology Congress ASIATRIB 2010, Perth, Australia, 5-9 December 2010, and also Tribology Letters, Vol.43, 2, pp.129-137, August 2011.
  • Guo F., Li X.M. and Wong P.L., “A novel approach to measure slip-length of thin lubricant films under high pressure”, presented at the 37th Leeds/Lyon Symposium on Tribology, Leeds, England, September 2010, and also Tribology International, Vol.46, No. 1, pp.22-29, Feb. 2012.
  • Chan Y.T., Wong P.L., Liu K.P. and Bullough W.A., “Repulsive normal force by an excited magneto-rheological fluid bounded by parallel plates in stationary or rotating shear mode”, J. INTEL. MAT. SYS., Vol.22, 6, pp.551-560, April 2011.
  • Liu X., Wong P.L., Wang W. and Bullough W.A., “Feasibility study on the storage of magneto-rheological fluid using metal foams”, J. INTEL. MAT. SYS., Vol.21, 12, pp.1193-1200, August 2010.
  • Wong P.L., He F. and Zhou X., “Interpretation of the hardness of worn DLC particles using micro-Raman spectroscopy”, presented at the 36th Leeds/Lyon Symposium on Tribology, Lyon, France, September 2009, and also Tribology International, Vol.43, No. 10, pp.1806-1810, October 2010.
  • Guo F., and Wong P.L., “Full and partial boundary slippage effect on squeeze film bearings”, Tribology International, Vol.43, No. 5-6, pp.997-1004, May 2010.
  • He F., Wong P.L. and Zhou X., “Wear properties of DLC-coated steel rollers running with highly contaminated lubrication”, Tribology International, Vol.43, No. 5-6, pp.990-996, May 2010.
  • Guo F., Wong P.L., Fu Z., and Ma C., “Interferometry measurement of lubricating films in slider-on-disc contacts”, Tribology Letters, Vol.39, No.1, pp.71-79, July 2010.
  • Guo F., Wong P.L., Geng M. and Kaneta M., “Occurrence of wall slip in elastohydrodynamic lubrication”, Tribology Letters, Vol.34, pp.103-111, February 2009.
  • Fu Z., Guo F. and Wong P.L., “Theoretical study on the interferometry of thin EHL film measurement”, Tribology Letters, Vol.31, No. 1, pp.57-65, July 2008.
  • Guo. F., Fu Z., Wong P.L. and Yang P., “Experimental study on the lubrication regime variation in point contacts”, Tribology International, Vol.41, No. 6, pp.451-460, June. 2008.
  • Wang W., Wong P.L., He F. and Wan G.T.Y., “Experimental study of the smoothing effect of a ceramic rolling element on a bearing raceway in contaminated lubrication”, Tribology Letters, 28, 1, pp.89-97, Oct. 2007.
  • Fu Z., Guo F. and Wong P.L., “Non-classical elastohydrodynamic lubricating film shape under large slide-roll ratios”, Tribology Letters, 27, 2, pp.211-219, Aug. 2007.
  • Guo F. and Wong P.L., “Theoretical prediction of hydrodynamic effect by tailored boundary slippage”, Proceedings of the I MECH E Part J Journal of Engineering Tribology, Vol.220, pp.43-48, Mar. 2006.
  • Guo F. and Wong P.L., “An anomalous elastohydrodynamic lubrication film – inlet dimple”, Trans. ASME J. of Tribo., Vol. 127, No. 2, pp.425-434, Apr. 2005.
  • Wang W., Wong P.L. and Guo F., “Application of partial elastohydrodynamic lubrication analysis in dynamic wear study for running-in”, Wear, Vol.257, 7-8, pp.823-832, Oct. 2004.
  • Leung W.C., Bullough W.A., Wong P.L. and Feng C., “The effect of particle concentration in a magneto rheological suspension on the performance of a boundary lubricated contact”, Proceedings of the I MECH E Part J Journal of Engineering Tribology, Vol.218, pp.251-263, Sep. 2004.
  • Guo F. and Wong P.L., “A wide range measuring system for thin lubricating film: from nano to micro thickness”, Tribology Letters, Vol. 17, No. 3, pp.521-531, Oct. 2004.
  • Guo F. and Wong P.L., “Experimental observation of a dimple-wedge elastohydrodynamic lubricating film”, Tribology International, Vol.37, No. 2, pp.119-127, Feb. 2004.
  • Wong P.L., Guo F., and Feng C., “The measurement of the refractive index of a liquid lubricant at high pressure within an EHL impact dimple using a single optical interferogram”, Tribology International, Vol.36, No. 7, pp.497-504, Jul. 2003.
  • Wang W., and Wong P.L., “The dynamic measurement of surface topography by a light-section technique”, Tribotest. 9-4, pp.305-316, June 2003.
  • Jiang H., Wong P.L., Meng Y., and Wen S., “An indirect electric field effect on the friction of boundary lubricated contact”, Lubrication Science, 15-3, pp.275-292, May 2003.
  • Wong P.L., Huang P., and Meng Y., “The effect of the electric double layer on very thin water lubricating film”, Tribology Letters, Vol.14, No.3, pp.197-203, April 2003.
  • Bullough W.A., Wong P.L., Feng C. and Leung W.C., “Fundamental boundary Tribology: ESF”, J. Intel. Mat. Sys., Vol.14, No.2, pp.71-78, Feb. 2003.
  • Guo F., and Wong P.L., “A multi-beam intensity-based for lubricant film measurements in non-conformal contacts”, Proceedings of the I MECH E Part J Journal of Engineering Tribology, Vol.216, 5, pp.281-291, Oct. 2002.
  • Guo F., Wong P.L., Yang P., and Yagi K., “Film formation in EHL point contacts under ZEV conditions”, STLE Tribology Transaction, Vol.45, No.4, pp.521-530, Oct. 2002.
  • Meng Y, Jiang H., and Wong P.L., “An experimental study on voltage-controlled friction of alumina/brass couples in zinc stearate/water suspension”, STLE Tribology Transaction, Vol.44, No.4, pp.567-574, Oct. 2001.
  • Guo F., Yang P., and Wong P.L., “On the thermal elastohydrodynamic lubrication in opposite sliding circular contacts”, Tribology International, Vol.34, No. 7, pp.443-452, Jul. 2001.
  • Jiang H., Wong P.L., and Meng Y., “Influence of ‘off-contact’ electric potential on frictional behaviours of agate/brass (SiO2/Cu) rubbing couple”, Proceedings of the I MECH E Part J Journal of Engineering Tribology, Vol.215, 2, pp. 201-206, Apr. 2001.
  • Wong P.L., Bullough W.A., Feng C., and Lingard S., “Tribological Performance of a Magneto Rheological Suspension”, Wear, Vol.247, 1, pp.33-40, Jan. 2001.
  • Wang W., and Wong P.L., “Wear Volume Determination During Running-in for PEHL Contacts”, Tribology International, Vol. 33, No. 7, pp.501-506, Jul. 2000.
  • Wang W., Wong P.L., and Zhang Z., “Experimental Study of the Real Time Change in Surface Roughness During Running-in for PEHL Contacts”, Wear, Vol.244, 1-2, pp.140-146, Aug. 2000.

Last modified on 6 August, 2019