Drying properties of sweet potato (Ipomoea batatas poir) taro (Colocasia esculemta L. Schott) and yam (Discorea alata L.).

Date

1984

Abstract

The drying rate constant and mass diffusivity of water in sliced sweet potato (Ipomoea batatas Poir), taro (Colocasia esculenta L. Schott), and yam (Dioscorea alata L.) at four drying temperatures were evaluated. The linear portion of the drying curves at four drying temperatures are expressed by regression equation, while the values of the mass diffusivity of water for the materials at four drying temperatures were obtained using the negative exponential equation of the falling-rate period. The equilibrium moisture content of dried slices of sweet potato, taro and yam at several relative humidities and room temperatures were evaluated. The mathematical characteristics of equilibrium moisture curves of the dried slices of materials used were obtained using the exponential equation by Henderson, 1951. Deviation of the plotted curves and the observation data were evaluated by multiplying regression using least-squares method, using 95 percent confidence interval and (n-3) degrees of freedom while the coefficient of multiple determination, R^2 y.12' and the coefficient of partial determination, R2 y.1' were used to indicate the influence of relative humidity and temperature to the values of the equilibrium moisture content of the materials.

Document Type

Master Thesis

Degree

Master of Science in in Agricultural Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Language

English

LC Subject

Sweet potatoes, Taro, Yams

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 1984 A2 H45

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