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Articles by Sivakumar Kumaresan
Total Records ( 2 ) for Sivakumar Kumaresan
  Md. Mizanur Rahman , Sivakumar Kumaresan and Chu Chi Ming
  The aim of this study was to analyze the temperature profile in the Zone of Flow Establishment (ZFE) above a 0.56 m2 hot screen placed at different height above an electrically heated model air-cooled heat exchanger operating under natural convection. Installation of screens increased the temperature difference from 30 to 140 K with respect to ambient that resulted in the air velocity increased at the inlet of the special duct from 0.67 m sec-1 to more than 2.0 m sec-1 under different heat loads ranging from 1 to 2.5 kW. The investigation of temperature profile was done above the hot screens placed at 0.35, 0.65, 0.95 and 1.25 m height over the electrically heated model air-cooled heat exchanger. The results show that the exit air temperature near to the electric heater and above the hot screens did not differ significantly but at heights of 0.09 m and upward the temperature difference differed by 2 to 6 K depending on the height of the hot screens. Maximum temperature difference was observed for hot screen placed at 0.65 and 0.95 m. Although, the temperatures at the beginning of the zone of flow establishment were almost the same for every heat load, the radial profile of temperature turned from parabolic in shape to uniformly flat for the configuration without screen and with screen respectively. This indicates turbulence increase above the hot screens.
  Hooi-Kim Phang , Sivakumar Kumaresan and Chi-Ming Chu
  The drying characteristics of Palm Kernel Cake (PKC) were investigated in a radial flow packed bed to understand the transfer processes in Solid State Fermentation (SSF). The 1.50 mm Palm Kernel Cake (PKC) particles with an initial moisture content of 50% on dry basis (d.b) was the filler material. The drying experiments were conducted using heated ambient air for four air temperatures (35, 45, 55 and 65°C) and three air flows (65.33, 75.33 and 92.33 LPM) in a laboratory radial flow packed bed. The drying data were then fitted to the different semi-theoretical models such as Lewis, Page, modified Page, logarithmic and Henderson and Pabis based on the ratio of the difference between the initial, final moisture content and the equilibrium moisture content. The models were evaluated by comparing the determination coefficient (R2) and Root Mean Square Error (RMSE) through non linear regression analysis. The drying air temperature was found to be the dominant factor affecting the drying kinetics of PKC.
 
 
 
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