| Popis: |
HEAT and mass transfer coefficients were determined for 51-mm thick aspen excelsior pads. The 594-mm square pads were vertically and horizontally oriented in wind tunnels, and measurements were made of flow rates and entering and exiting temperatures. Using these data plus results from previous work, the following correlation equations were obtained. where hLaH is the product of the liquid film heat transfer coefficient, hL(kW/m2C), and the area available for heat exchange per volume of pad, aH(*n2/m3). Ga is the airflow rate (kg/s m2 of air face area) and GL is the water flow rate (kg/s m2 of air face area). The correlation applied to both vertical and horizontal pads. For horizontal pads where ha is the gas film heat transfer coefficient. The flow rates ranged from 0.5 to 1.3 for air and from 0.045 to 1.0 for water. The mass transfer coefficient could be determined from the latter equations using the Lewis relation. |
