Simulation of Turbulent Flow in a Compact Heat Exchanger
In this tutorial, we provide guidelines for modeling and simulation of liquid ammonia flowing through the specified interrupted fin compact heat exchanger. Also, we evaluate the pressure drop and heat transfer characteristics of flow at a specific mass flux. We also estimate the average drag coefficient and average Stanton number by considering all factors for turbulence modeling. We will compare our results with the empirical data.
Compact Heat Exchanger
Here we model a compact heat exchanger that uses interrupted and staggered fins. The fins enhance the heat transfer relative to a continuous fin heat exchanger. The mechanism of the enhanced heat transfer is as follows. Fins promote turbulent mixing in the wake region and this results in relatively high heat transfer coefficients as the boundary layers continuously re-form on the interrupted fins.
Problem Description of Turbulent Flow in a Compact Heat Exchanger
We use symmetry boundary conditions at the top and bottom planes of our model. Also, pressurized liquid ammonia is heated at 240 K in the heat exchanger. The fin walls temperature is 350 K. Also, the mass flux of liquid ammonia is 303.14 kg/s-m2. The hydraulic diameter is 3.51 mm. Reynolds number based on hydraulic diameter is 7000 (turbulent regime). In addition, we use periodic boundaries at the beginning and ending planes of the domain. The Periodic mass flow rate is 1.385 kg/s.
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