Hemant P. Pendse
University of Maine Pulp and Paper Foundation Faculty Fellow
Director, Industrial Process Control Sensor Systems Program
Sensor development • colloid systems • particulate and multiphase processes • pulp and paper manufacture
Focus of research activities in this area is on physico-chemical hydrodynamics of concentrated colloidal dispersions. Recent efforts have been aimed at understanding effects of acoustic and electric fields. Work on applications of electrokinetics involves retention and drainage in papermaking as well as in liquid filters.
Research in papermaking is focused on wet-end operations and paper coating. Current activities involve studies of electrokinetics of headbox furnish, dynamic drainage, fiber flocculation, and coatings characterization. Role of colloid and surface chemistry in papermaking unit operations remains the main area of interest.
Fluid Particle Systems
This research involves analysis of various transport processes occurring in multi-particle systems. These include fluid flow and axial dispersion within packed beds, attenuation of sound waves through suspensions, and vibration potentials associated with sound propagation through colloidal suspensions.
Currently, work involves development of on-line and laboratory sensor systems for characterization of industrial suspensions, emulsions, and aerosols. Issues of online monitoring of particle size and shape are addressed. Several projects are active in the acoustic sensors area. Applications of neural nets for intelligent sensor design are also underway. Recent work has culminated in two commercial laboratory instruments for particle analysis in concentrated suspensions. Associated development of a novel Ultrasonic Slurry Characterization Chamber has given rise to a new microenterprise business in Maine.
Pendse, H. P., “Friction Factor for Analysis of Acoustophoresis in Concentrated Colloidal Suspensions”, J. Chi. Inst. Chem. Engrs., Vol. 35, 23-29 (2004).
Hackley, V. A., Patton, J., Lum, L. H., Wasche, R. J., Naito, M., Abe, H., Hotta, Y. and Pendse, H., “Analysis of the Isoelectric Point in Moderately Concentrated Alumina Suspensions Using Electroacoustic and Streaming Potential Methods,” Journal of Dispersion Science and Technology, Vol. 23(5), 601-617 (2002).
W. Han and H.P. Pendse, “Unified Coupled Phase Continuum Model for Acoustic Attenuation in Concentrated Dispersions,” in Ultrasonic And Dielectric Characterization Techniques, Eds. V. Hackley and J. Texter, American Ceramic Society, 129-152 (1998).
A. Sharma and H.P. Pendse, “Ultrasonic Spectroscopy Measurement System for
On-line Sensing of Concentrated Particulate Suspensions,” in Ultrasonic And Dielectric Characterization Techniques, Eds. V. Hackley and J. Texter, American Ceramic Society, 177-189 (1998).
H.P. Pendse, T. C. Bliss, and W. Han, “Particle Shape Effects and Active Ultrasonic Spectroscopy,” in Ultrasonic And Dielectric Characterization Techniques, Eds. V. Hackley and J. Texter, American Ceramic Society, 165-175 (1998).
H.P. Pendse, M.T. Musavi, G. Sirdeshpande, and K.P. Kehrer, “Sensors for Industrial Slurries as Virtual Analyzers of Mat Quality,” Particle and Particle Systems Characterization (VCH, Weinheim), 15, 26 (1998).
Razilov, J., H. P. Pendse and S. S. Dukhin, “Quasi-Equilibrium Polarization of the Stern Layer and Low-Frequency Dielectric Dispersion,” Colloid Journal, 56(5), 612-620 (1994).[Russian Text: Kolloidnyi Zhurnal, 56(5), 687-696 (1994)]
Zharkikh, N., H. P. Pendse, and S. S. Dukhin, “Additional Surface Conductance of the Thin Porous Surface Layer of a Colloidal Particle ,” Colloid Journal, 56(5), 573-578 (1994).[Russian Text: Kolloidnyi Zhurnal, 56(5), 648-653 (1994)]
Pendse H. P. and A. Sharma, “On-line Instrumentation for Size Distribution Analysis of Industrial Colloidal Slurries Using Ultrasound,” First International Particle Technology Forum Proceedings – Part I, AIChE Press, 136 (1994).
Pendse, H. P. and W. Han, “Ultrasound Characterization of Concentrated Colloidal Suspensions Containing Nonspherical Particles,” First International Particle Technology Forum Proceedings – Part I, AIChE Press, 142 (1994).
Pendse H. P. and S. S. Dukhin, “Development of a Dielectric Spectroscopy Probe for Charge and Size Analysis of Industrial Slurries: Phase II Interim Technical Report”, submitted to DOE SBIR Office under Grant No. DE/92/ER/81410 (1994).