Showing papers by "Sreenivas Jayanti published in 2019"
TL;DR: In this paper, the effect of channel dimensions of a vanadium redox flow battery on the performance of the battery has been investigated experimentally, and the results show that sensitivity to channel dimensions is more keenly felt in the larger cell with noticeable improvements in pressure drop, peak power density and discharge energy density.
Abstract: For high current density operation of redox flow batteries, proper circulation of the electrolytes over the active area of the cell is important. In the present paper, we study experimentally the effect of channel dimensions of a serpentine flow field for vanadium redox flow battery applications. The study encompasses three aspects: effect on the extent of felt intrusion into the flow channels, effect on the pressure drop over a cell for a given electrolyte circulation rate, and effect on the electrochemical performance characterized by a number of parameters. Eight variants of channel and/or rib dimensions in serpentine flow fields have been studied in cells of 400 cm2 and 900 cm2 active area. A lumped parameter model, validated with water and electrolyte circulation data, has been developed to predict the pressure loss and flow apportionment in the cell. The results show that sensitivity to channel dimensions is more keenly felt in the larger cell with noticeable improvements in pressure drop, peak power density and discharge energy density. Increasing channel width and decreasing rib width is recommended as the ideal strategy to improve the overall performance of the cell.
40 citations
TL;DR: In this paper, experimental investigations have been conducted in vanadium redox flow battery cells of active area of 426 cm2 and 936 cm2 over a wide range of operating conditions typical of large cells and for electrode compressions of 20, 35, 50 and 70%.
30 citations
TL;DR: It is shown that a combination of steadily-operated compact ethanol reformer, a low-power battery continuously charged by excess reformer capacity and a high-power fuel cell powered by conservatively-used hydrogen from cylinder can increase the range of hybrid fuel cell drivetrains to about 750 km.
16 citations
TL;DR: In this article, the authors studied the response of vertical annular flow to a sudden or gradual pipe contraction and developed a semi-empirical model for the pressure loss coefficient in the contraction.
5 citations
TL;DR: In this article, the complete reduction behavior of iron oxide to iron in ilmenite ore was studied thermogravimetrically in the temperature range of 900-1100 °C by 30% CO concentration over 200 min.
Abstract: The complete reduction behavior of iron oxide to iron in ilmenite ore was studied thermogravimetrically in the temperature range of 900–1100 °C by 30% CO concentration over 200 min. The rate of red...
4 citations