Multi Item Fuzzy Inventory Model with Storage Space, Production Cost and Lot Size Constraints -- A Karush Kuhn Tucker Conditions Approach

In this paper a multi-item inventory model with storage space , number of orders and production cost as constraints has been formulated. A demand dependent unit cost is assumed to minimize the total annual cost and solved using Karush-Kuhn-Tucker condition. In most of the real world situations, the cost parameters, the objective functions and constraints of the decision makers are imprecise in nature. Here the cost parameter is imposed in fuzzy environment .The model is illustrated with numerical example for single item

Influence of nanoparticles on the effectiveness of heat exchanger and associated pressure drop

Heat exchanger is the essential device for almost all the industrial process heating and cooling equipment. Heat is transferred from one fluid to other by the mode of convection and conduction through the wall of the heat exchanger. Effectiveness of heat exchanger depends on the overall heat transfer coefficient. Heat transfer coefficient of pure water, Al2O3-water, CuO-water, and Fe2O3-water nanofluids has been studied. This paper addresses experimental results of the transient and turbulent region of forced convective heat transfer of water based nanofluids compared to that of distilled water. Four different concentrations of nanofluids in the range of 0.5% to 2% by mass have been prepared for Al2O3, CuO and Fe2O3. These nanofluids of different concentrations flows through counter flow heat exchanger. Different parameters affecting the heat transfer characteristics were studied and the influence of each parameter is noted. The overall heat transfer coefficient has been calculated with respect to associated pressure drop.nbs