Zagazig University Digital Repository
Home
Thesis & Publications
All Contents
Publications
Thesis
Graduation Projects
Research Area
Research Area Reports
Search by Research Area
Universities Thesis
ACADEMIC Links
ACADEMIC RESEARCH
Zagazig University Authors
Africa Research Statistics
Google Scholar
Research Gate
Researcher ID
CrossRef
A mathematical model of direct sun and solar drying of some fermented dairy products (Kishk)
Faculty
Agriculture
Year:
2004
Type of Publication:
Article
Pages:
309-319
Authors:
Bahnasawy, AH, Shenana, ME
DOI:
10.1016/S0260-8774(03)00134-1
Journal:
JOURNAL OF FOOD ENGINEERING ELSEVIER SCI LTD
Volume:
61
Research Area:
Engineering; Food Science \& Technology
ISSN
ISI:000189285500004
Keywords :
fermented dairy products, drying, model, moisture, Kishk
Abstract:
A mathematical model of direct sun and solar drying of some fermented dairy products (Kishk) was developed. Solar radiation, heat convection, heat gained or lost from the dryer bin wall and the latent heat of moisture evaporation were the main components of the equations describing the drying system. The model was able to predict the drying temperatures at a wide range of relative humidity values. It has also the capability to predict the moisture loss from the product at wide ranges of RH values, temperatures and air velocities. The model showed a dramatic effect of the air velocity on increasing the moisture loss at the beginning of the drying process and became constant which leads to a recommend that it is better to use low temperature with forcing air at the beginning of drying. In the next stages, high temperature without forcing air should be used. The model was validated by using experimental data of the drying temperatures and moisture loss under both direct sun and solar drying systems for five fermented dairy products (Kishk). The predicted values were in a reasonable agreement with the experimental data. The coefficients of determination for the predicted moisture loss in case of the sun drying system were lower than those under the solar drying. This may be attributed to the deeper grooves and cracks on the surface of the products, the heat conducted from the drying trays and the variation of the measured wind speed. (C) 2003 Published by Elsevier Ltd.
Online
PDF
جامعة المنصورة
جامعة الاسكندرية
جامعة القاهرة
جامعة سوهاج
جامعة الفيوم
جامعة بنها
جامعة دمياط
جامعة بورسعيد
جامعة حلوان
جامعة السويس
شراقوة
جامعة المنيا
جامعة دمنهور
جامعة المنوفية
جامعة أسوان
جامعة جنوب الوادى
جامعة قناة السويس
جامعة عين شمس
جامعة أسيوط
جامعة كفر الشيخ
جامعة السادات
جامعة طنطا
جامعة بنى سويف