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SIMULATION OF HEAT AND MASS TRANSFER PROCESSES IN A SURROGATE BRONCHIAL SYSTEM DEVELOPED FOR HYGROSCOPIC AEROSOL STUDIES
Citation:
Eisner, A. AND T. Martonen. SIMULATION OF HEAT AND MASS TRANSFER PROCESSES IN A SURROGATE BRONCHIAL SYSTEM DEVELOPED FOR HYGROSCOPIC AEROSOL STUDIES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/444 (NTIS PB91109363), 1989.
Description:
A surrogate tracheobronchial (TB) system, capable of simulating the in vivo atmosphere (i.e., temperature and relative humidity) in a physiologically realistic manner, is reported here. his surrogate Toxicology Branch system is a tubular, multicomponent physical model where the average Reynolds number value for the airflow within each respective compartment, or section, equals the value within the corresponding bronchial airway generation of Weibel's Model A network. ass-transport phenomenon (i.e., the in vivo water flow through a TB wall and its membrane, and subsequent water evaporation into inhaled air) was simulated using this system. etailed information regarding localized air temperature and water vapor concentration patterns for the steady flow rate of 13.5 l/min is reported in this work. he impact of the laryngeal simulator was studied, and average values of Nusselt and Sherwood numbers for each bronchia generation are reported. hese values were lowest downstream from the laryngeal simulator. he in vitro temperature and water vapor concentration patterns and transfer coefficients can be used in a future quantitative analysis of the dynamic behavior and deposition rates of hygroscopic aerosol particles.
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SIMULATION OF HEAT AND MASS TRANSFER PROCESSES IN A SURROGATE BRONCHIAL SYSTEM DEVELOPED FOR HYGROSCOPIC AEROSOL STUDIES