We minimize, with respect to the cross sectional area, the mass of a bar given the rate of heat transfer. The bar enhances the heat transfer surface of a larger known mass to which the bar is attached. This article is an extension of a previous publication by two coauthors, where heat transfer from the sides of the bar was neglected and only conduction through its length was considered. The rat...

Biogas has become one of the promising alternative fuels. This is triggered by relative ease production while on other hand raw material cheap and easy to be obtained. In order get higher biogas rate, a work been done with digester cross-sectional area modification. Under modification an improvement in yield was The research also opened up new outlook set better design for maximum production. e...