Natural convection from pin fin arrays

Computation of Natural Convection in Channels With Pin Fins

“…However the peak is shallow in the range of porosities investigated. This is close to the optimum porosity for forced flow found by Zografos and Sunderland [22], and similar to the minimum found for in-line arrays in Jain et al [8]. The effect of vertical spacing is studied by varying the vertical spacing (b1-b4) keeping the horizontal spacing constant at .…”

“…An optimal porosity of 87% was obtained for both types of arrays. Zografos and Sunderland [22] experimentally found an optimal porosity of 90% among four heat sinks with porosities in the range of 60 to 90%. An analytical study was performed on a pin-fin heat sink in a chimney by Fisher et al [7].…”

Natural convective performance of perforated heat sinks with circular pin fins

“…It is because that the temperature of the insulation within the copper heater plate is nearly the same as the ambiance. Following the procedure by Zografos and Sunderland [22], the radiation heat transfer (Q rad ) can be estimated as:…”

Heat transfer enhancement in natural convection between vertical and downward inclined wall and air by pulsating jets

“…More recently, other investigations had been concerned about the possibility of a considerable enhancement of heat transfer by means of fins and pins, namely by passive devices [4][5][6][7]. Zografos et al [4], analyzed three pin fin arrays and developed an empirical model that predicts its performance for a wide range of Rayleigh numbers and geometries. In particular, they found out that a pin fin arrays performs better than a plate fin array under the same conditions and the best performance occurs when the most significant parameter, namely the ratio of fin diameter to center-to-center spacing, is about 1/3.…”