摘要:

ABSTRACTA mathematical approach for the optimal design of a rotary cutter by using Lagrangian Multipliers, in the continuous production of chapatis (Indian unleavened flat bread), is presented.The objective function has been taken as the output and the constraints have been recognized as diameter and speed of rotation of the roller, number of cutters, diameter of the cutter and gap between the cutters. the numerical profile obtained from the method is in close agreement with the experimental values. It has been observed that, within the range of roller diameters and rotational speeds studied, the roller of diameter 0.165 m with three cutters was optimal with an output of 710 units h−1, leaving about 38% scrap dough for recyclin

ISSN:0145-8876    

DOI:10.1111/j.1745-4530.1993.tb00163.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

ABSTRACTThe Helical Screw Rheometer (HSR) is being evaluated for rheological measurements of fluid food suspensions. the HSR consists of a helical screw enclosed in a tight fitting cylinder. With a closed system the inner screw is rotated creating a linearly increasing pressure differential along the axis of the screw, which is proportional to the viscosity of the fluid. This paper presents theoretical one‐ and two‐dimensional flow analyses for Newtonian fluids using both rectangular and cylindrical coordinates. For non‐Newtonian fluids a one‐dimensional rectangular analysis was developed using the power la

ISSN:0145-8876    

DOI:10.1111/j.1745-4530.1993.tb00164.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

ABSTRACTThis paper describes a numerical solution procedure to study heat and moisture transfer processes by two‐dimensional natural convection phenomena in grain stores with arbitrary geometries. This enables grain storage technologists to investigate the design and performance of grain stores in which the grain surface is peaked, as in bunker storage, for example. Momentum transfer is described by an elliptic partial differential equation, which governs the behavior of the stream function. Using an algebraic grid generation technique, the governing equations are transformed into a body‐fitted rectangular coordinate system that allows coincidence of all boundary lines with a coordinate line. Numerical solutions of the resulting equations are obtained using an alternating direction implicit method. Results from numerical experiments on a peaked bulk of stored grain retained between two vertical walls are obtained that show the magnitude and directions of convection currents and contours of temperature, moisture, dry matter loss and chemical pesticide concentrati

ISSN:0145-8876    

DOI:10.1111/j.1745-4530.1993.tb00165.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

ABSTRACTThe broad range of moisture sorption isotherm (MSI) data of mango is divided into two ranges of submoisture sorption isotherms (sub‐MSI), corresponding to two different ranges of water activity; the net isosteric heat of sorption (qst) is used as subdivision criterion of these two ranges. the sub‐MSI are fitted to a general elquation. the mean error is 5% for the first sub‐MSI (qst) and 10% for the second (qs

ISSN:0145-8876    

DOI:10.1111/j.1745-4530.1993.tb00166.x

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY