With FC-72 as a work atmosphere, pressure Fins, which can resist the flow as well. Heat transfer coefficients of the reduced spacing of bars fins reduced.
The FC-72 as the working fluid at atmospheric pressure. The fins can withstand high flow well. Reduced heat transfer coefficient. The spacing of the rods, fins down.
The FC-72 as working fluid at atmospheric pressure. High fin can resist flow well. Heat transfer coefficient decreases. At a distance of fin rods decreased.