A model to Study the Efficiency of a Spray Dryer's 18 kW Hot Air Generator
Keywords:
Spray Dryer, Hot Air Generator, Model, Guide Vane, Heat TransferAbstract
This papers a model to study the efficiency of a spray dryer’s 18 kW hot air generator was the model study for analyzing air streamline, air temperature, and parameters that affected the efficiency. The study was simulated under 3 conditions which are the direct connection without the fitting of the duct, the installation of the guide vane, and the connection with fitting. The simulation results showed that the guide vane installation and the fitting connection increased the flow efficiency by 82.08% in condition 2, in condition 3 is 52.61%, and 32.8% in condition 1 respectively. Moreover, the relationship between flow trajectories that affected heat transfer resulted in turbulence, and directionless flow created a wake, which decreased the contact area of heat transfer and increased pressure and friction. The first condition without any fitting showed the wakes occurred in many positions with large sizes. The air streamline was complicated and directionless. On the contrary, after installing the guide vane and fitting in the second and third conditions, the wakes decreased and got smaller. Additionally, the airflow was smooth and simultaneous in direction. Furthermore, the electrical power of cylindrical heater coils arranged in a staggered form was appropriate for heat transfer.
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