Essentially, my research interest lies in the Thermal and Fluid Sciences, including fundamentals of fluid mechanics and heat transfer, experimental and computational study on atmospheric flows, boundary layer meteorology in urban environments, equations of state of various fluids and so on. My advisor is Dr. Marko Princevac. |
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| Current Projects |
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| Dispersion from a distributed generation (DG) unit |
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A dispersion study to investigate the impact of DGs on urban environment took place in Palm Springs, CA. The tracer gas was released from a DG unit and the ground level concentrations were recorded by bag samplers. A scale-down urban setting of the DG unit and surrounding buildings was constructed in the water channel. The concentration field of a florescent dye was measured by the Planar Laser-Induced Florescence (PLIF) and compared with field data and AERMOD results.
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| Laboratory simulations of atmospheric flow within the urban canopy |
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Laboratory simulations of atmospheric flow within the urban canopy was made in the water channel with the assistance of Particle Image Velocimetery (PIV) system.
Publications:
X. Li, H. Pan, T.R. Cole, and M. Princevac, Flows inside a simple urban array: water channel modeling results, 5th International Symposium on Environmental Hydraulics, Dec. 2007, Tempe, AZ.
M. Princevac, H. Pan, X. Li, and M. Brown, Flow pattern with cubical arrays of obstacles - water channel results, 60th APS Division of Fluid Dynamics Annual Meeting, Nov. 2007, Salt Lake City, UT.
H. Pan, X. Li, M.J. Brown, J.-J. Baik, S.-B. Park, and M. Princevac, Mean flow pattern through a simple mock urban array - water channel experiments and modeling, 7th Symposium on the Urban Environment, Sep. 2007, San Diego, CA.
T.R. Cole, X. Li, and M. Princevac, Laboratory modeling of a simple urban environment, 87th AAAS Pacific Division Annual Meeting, Jun. 2006, San Diego, CA.
T.R. Cole, X. Li, C. Eising, and M. Princevac, Turbulence and channeling in a simple urban environment, 17th Symposium on Boundary Layers and Turbulence, May. 2006, San Diego, CA.
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| Turbulent kinetic energy balance in the atmospheric surface layer |
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Based on field data from five sonic anemometers in the 2002 Hanford Experiment, turbulent kinetic energy (TKE) was found to be locally imbalanced in the atmospheric surface layer, i.e., the locally generated TKE does not balance local TKE dissipation. A modified form of parameterization of dimensionless TKE budget functions is proposed to address this problem.
Publications:
X. Li, N. Zimmerman, and M. Princevac, 2008, Local imbalance of turbulent kinentic energy in the surface layer, Bound.-Layer Meteorol., Online.
X. Li, N. Zimmerman, and M. Princevac, Local imbalance of turbulent kinetic energy and the dissipation parameterization in the surface layer, 5th International Symposium on Environmental Hydraulics, Dec. 2007, Tempe, AZ.
X. Li, N. Zimmerman, and M. Princevac, Characterization of turbulent kinetic energy budget in the atmospheric surface layer, 16th Conference on Atmospheric and Oceanic Fluid Dynamics, Jun. 2007, Santa Fe, NM.
Presentations on the TKE budget in:
2nd Annual Mechanical Engineering Graduate Research Symposium at UCR (2/8/07)
2nd SoCal Symposium on Flow Physics at Caltech (4/7/07)
16th Conf. Atmos. Oceanic Fluid Dynamics at Santa Fe [Poster] (6/25/07)
5th International Symposium on Environmental Hydraulics at ASU (12/7/07)
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| Previous Projects |
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| Sea breeze in the Wilmington 2005 Dispersion Study |
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| Lidar Accuracy for Boundary Layer Measurements |
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The Coherent Doppler lidar technology provides an effective way for remote measurements of the mean winds and turbulence in the atmospheric boundary layer. However, lidars are prone to the noise related measurement errors. We calculated the variance as well as standard deviation of estimation errors from the integral of the spectrum between a certain threshold frequency and the Nyquist frequency.
Publications:
X. Li, M. Princevac, and R. Calhoun, Accuracy of a Coherent Doppler Lidar for the Urban Boundary Layer Measurements, ASME Intl. Mechanical Engr. Congress, Nov. 2005, Orlando, FL.
Presentation on lidar accuracy at ASME (11/10/05) |
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| Thermophysical Properties of Helium-3 @ Zhejiang Univ., China |
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He3 is one of the two stable isotopes of helium in nature. Until today there is no database or calculating program for He3 in a wide range. We made an overall survey of thermophysical properties of He3 and attempted to establish an Helmholtz Energy explicit equation of state for He3 in a wide range of temperatures and pressures.
My bachelor dissertation "Study on Thermodynamic Properties of He3 at Low Temperatures and Development of a Data Calculating Program" was awarded the ZJU Excellent Undergraduate Dissertation in 2003.
Publications:
Y.H. Huang, G.B. Chen, X.Y. Li, and V.D. Arp, 2005, Density Equation for Saturated 3He, Intl. J. Thermophys., 26, 29-741.
X.Y. Li, Y.H. Huang, G.B. Chen, and V.D. Arp, Density Equation for Saturated Helium-3, 20th Intl. Cryo. Engr. Conf. (ICEC20), May 2004, Beijing.
Y.H. Huang, G.B. Chen, X.Y. Li, Discussion on Gibbons' Equation of State for Helium-3, 20th Intl. Cryo. Engr. Conf. (ICEC20), May 2004, Beijing.
Y.H. Huang, G.B. Chen, N. Jiang, and X.Y. Li, 2003, The Computer Program for Thermodynamic Properties of Helium-3, Proc. ICCR2003, 51, International Academic Publishers, 2003, Beijing. |
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