Modeling of Heat Transfer in a Mist/Steam Impinging Jet
Author:
Li X.1, Gaddis J. L.1, Wang T.2
Affiliation:
1. Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921 2. Energy Conversion and Conservation Center, University of New Orleans, New Orleans, Louisiana 70148-2220
Abstract
The addition of mist to a flow of steam or gas offers enhanced cooling for many applications, including cooling of gas turbine blades. The enhancement mechanisms include effects of mixing of mist with the gas phase and effects of evaporation of the droplets. An impinging mist flow is attractive for study because the impact velocity is relatively high and predictable. Water droplets, less than 15 μm diameter and at concentrations below 10 percent, are considered. The heat transfer is assumed to be the superposition of three components: heat flow to the steam, heat flow to the dispersed mist, and heat flow to the impinging droplets. The latter is modeled as heat flow to a spherical cap for a time dependent on the droplet size, surface tension, impact velocity and surface temperature. The model is used to interpret experimental results for steam invested with water mist in a confined slot jet. The model results follow the experimental data closely.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference23 articles.
1. Goodyer, M. J., and Waterston, R. M., 1973, “Mist-Cooled Turbines,” Conf. of Heat and Fluid Flow in Steam and Gas Turbine Plant, Proc. of Institution of Mechanical Engineers, pp. 166–174. 2. Guo, T., Wang, T., and Gaddis, J. L., 2000, “Mist/Steam Cooling in a Heated Horizontal Tube Part I: Experimental System and Part II: Results and Modeling,” ASME J. Turbomach., 122, pp. 360–374. 3. Guo, T., Wang, T., and Gaddis, J. L., 2000, “Mist/Steam Cooling in a 180-Degree Tube,” ASME J. Heat Transfer, 122, No. 4, pp. 749–756. 4. Takagi, T., and Ogasawara, M., 1974, “Some Characteristics of Heat and Mass Transfer in Binary Mist Flow,” Proc. of 5th Int. Heat Transfer Conf., Tokyo, Japan Society of Mechanical Engineers, pp. 350–354. 5. Mastanaiah, K., and Ganic, E. N., 1981, “Heat Transfer in Two-Component Dispersed Flow,” ASME J. Heat Transfer, 103, pp. 300–306.
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