Suresh Dhaniyala

Suresh Dhaniyala
Associate Professor
204 CAMP
Clarkson University
PO Box 5725
Potsdam, NY 13699-5725

Phone: 315-268-6574
Fax: 315-268-6438
E-mail: sdhaniya@clarkson.edu
Curriculum Vitae

Education
B.Tech, Indian Institute of Technology
M.S., University of Delaware
Ph. D., University of Minnesota

Research Interests

Professor Dhaniyala's current research interests are in the fields of Nano-Aerosol, Aerosol and Cloud Physics, and Aerosol Instrumentation.

The numerical and theoretical research concerns improved, integrated modeling of fluid flow, particle transport, and aerosol thermodynamics under conditions of non-equilibrium. This research is of importance in short time-scale aerosol events and for high-speed particle analysis. The modeling techniques are also used in the development of new aerosol instruments optimized for accurate, fast response combined with ease of construction.

The experimental research has concentrated on the development of next generation of instruments for real-time characterization of nanoparticles and large particles. New designs for particle/gas sampling from high-speed aircraft for analysis of cloud systems are also being developed.

Current Research Projects

  • New Techniques for Aerosol-Cloud Analysis
    Aerosol influence on global climate is potentially as important as that of greenhouse gases, but our lack of detailed knowledge on the mechanisms of aerosol-cloud processes results in considerable uncertainty in global climate model (GCM) predictions. In particular, the contribution of aerosol indirect effect, associated with the complicated interaction of aerosol particles with the formation and precipitation efficiency of liquid-water, ice, and mixed-phase clouds, to the radiative forcing budget is largely uncertain. In-situ studies of atmospheric aerosol-cloud processes and improved microphysical modeling are required to better model and predict the role of aerosols particles in global climate. In this project, new techniques are being developed for accurate sampling and fast analysis of aerosol and cloud droplets from high-speed aircraft. In addition, optimized designs of gas-sampling inlets are also being developed. (Funded by NSF and NASA).
  • Nanoparticle Characterization
    Nanoparticles in the environment are produced as a result of both anthropogenic activities (e.g., combustion) and natural processes (e.g., biogenic). In the urban environments, nanoparticles generally dominate the aerosol number and surface distributions, but their properties are seen to have large spatial and temporal inhomogeneity. For effective characterization of nanoparticles, real-time measurements of physical and chemical properties are required. In this project, electrical mobility techniques are being used for the development of new, compact instruments for real-time nanoparticle sizing and compositional characterization. (Funded by NSF and NYSERDA).
  • Near Real-Time Aerosol Studies
    The deposition of pollutants associated with PM are significant inputs to many ecosystems. There is an urgent need for techniques that can measure PM and pollutants associated with PM at short enough time scales that sources of these particles can be characterized and mechanistic models of their chemistry and fate developed. Since health effects and deposition are dependent on particle size, these techniques should also be able to separate the PM by size before they are characterized. To avoid sampling artifacts, the particles must be separated from the gas stream before collection. Research for this project involves: study of large particle transport characteristics, theoretical , numerical, and experimental study of ground-based counterflow virtual impactor; and study of species desorbtion and transport characteristics as a function of gas flow and temperature. (Funded by NSF).
  • Numerical modeling of near-wall effects
    An ideal passive sampler for gas-phase species such as PAHs, PCBs, etc would have a high sampling rate that is largely independent of ambient wind-conditions. The development of such a sampler requires an understanding of the interaction of gas-phase species with wall surfaces for a range of flow conditions. Numerical simulations of this system are complicated by the availability of different parametric turbulent models in commercial CFD codes that result in varying fluid flow solutions for conditions consistent with those in passive samplers. In this study, numerical and experimental fluid flow and species-transport modeling are being performed to determine the modeling accuracies of different turbulent schemes, and to design an optimized passive gas sampler (Funded by Great Lakes Consortium).


Selected Publications
Thomas, JJ, Holsen TM, Dhaniyala S, Computational fluid dynamics modeling of two passive samplers, Environmental Pollution, Accepted for publication, 2005.

Dhaniyala, S; Wennberg, PO; Flagan, RC; Fahey, DW; Northway, MJ; Gao, RS; Bui, TP. 2004. Stratospheric aerosol sampling: Effect of a blunt-body housing on inlet sampling characteristics. Aerosol Science and Technology, 38 (11): 1080-1090.

Popp, PJ; Gao, RS; Marcy, TP; Fahey, DW; Hudson, PK; Thompson, TL; Karcher, B; Ridley, BA; Weinheimer, AJ; Knapp, DJ; Montzka, DD; Baumgardner, D; Garrett, TJ; Weinstock, EM; Smith, JB; Sayres, DS; Pittman, JV; Dhaniyala, S; Bui, TP; Mahoney, MJ. 2004. Nitric acid uptake on subtropical cirrus cloud particles (vol 109, art no D06302, 2004). Journal of Geophysical Research-Atmospheres, 109 (D8): art. no.-D08306.

Popp, PJ; Gao, RS; Marcy, TP; Fahey, DW; Hudson, PK; Thompson, TL; Karcher, B; Ridley, BA; Weinheimer, AJ; Knapp, DJ; Montzka, DD; Baumgardner, D; Garrett, TJ; Weinstock, EM; Smith, JB; Sayres, DS; Pittman, JV; Dhaniyala, S; Bui, TP; Mahoney, MJ. 2004. Nitric acid uptake on subtropical cirrus cloud particles. Journal of Geophysical Research-Atmospheres, 109 (D6): art. no.-D06302.

McKinney, KA; Wennberg, PO; Dhaniyala, S; Fahey, DW; Northway, MJ; Kunzi, KF; Kleinbohl, A; Sinnhuber, M; Kullmann, H; Bremer, H; Mahoney, MJ; Bui, TP. 2004. Trajectory studies of large HNO3-containing PSC particles in the Arctic: Evidence for the role of NAT. Geophysical Research Letters, 31 (5): art. no.-L05110.

Dhaniyala, S; Flagan, RC; McKinney, KA; Wennberg, PO. 2003. Novel aerosol/gas inlet for aircraft-based measurements. Aerosol Science and Technology, 37 (10): 828-840.

Hanisco, TF; Smith, JB; Stimpfle, RM; Wilmouth, DM; Perkins, KK; Spackman, JR; Anderson, JG; Baumgardner, D; Gandrud, B; Webster, CR; Dhaniyala, S; McKinney, KA; Bui, TP. 2002. Quantifying the rate of heterogeneous processing in the Arctic polar vortex with in situ observations of OH. Journal of Geophysical Research-Atmospheres 107 (D20): art. no.-8278.

Northway, MJ; Gao, RS; Popp, PJ; Holecek, JC; Fahey, DW; Carslaw, KS; Tolbert, MA; Lait, LR; Dhaniyala, S; Flagan, RC; Wennberg, PO; Mahoney, MJ; Herman, RL; Toon, GC; Bui, TP. 2002. An analysis of large HNO3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000. Journal of Geophysical Research-Atmospheres, 107 (D20): art. no.-8298.

Dhaniyala, S; Mckinney, KA; Wennberg, PO. 2002. Lee-wave clouds and denitrification of the polar stratosphere. Geophysical Research Letters, 29 (9): art. no.-1322.

Fahey, DW; Gao, RS; Carslaw, KS; Kettleborough, J; Popp, PJ; Northway, MJ; Holecek, JC; Ciciora, SC; McLaughlin, RJ; Thompson, TL; Winkler, RH; Baumgardner, DG; Gandrud, B; Wennberg, PO; Dhaniyala, S; McKinney, K; Peter, T; Salawitch, RJ; Bui, TP; Elkins, JW; Webster, CR; Atlas, EL; Jost, H; Wilson, JC; Herman, RL; Kleinbohl, A; von Konig, M. 2001. The detection of large HNO3-containing particles in the winter arctic stratosphere. Science, 291 (5506): 1026-1031.