Shalaby, S., Mustafa, M., Heikal, Y., El Attar, M. (2022). Effect of Variable Frequency Drive and Pipe Materials on Guava Juice Flow. Arab Universities Journal of Agricultural Sciences, 30(1), 29-41. doi: 10.21608/ajs.2022.115676.1453
Shereen Shalaby; Mubarak Mustafa; Yahiya Heikal; Mahmoud El Attar. "Effect of Variable Frequency Drive and Pipe Materials on Guava Juice Flow". Arab Universities Journal of Agricultural Sciences, 30, 1, 2022, 29-41. doi: 10.21608/ajs.2022.115676.1453
Shalaby, S., Mustafa, M., Heikal, Y., El Attar, M. (2022). 'Effect of Variable Frequency Drive and Pipe Materials on Guava Juice Flow', Arab Universities Journal of Agricultural Sciences, 30(1), pp. 29-41. doi: 10.21608/ajs.2022.115676.1453
Shalaby, S., Mustafa, M., Heikal, Y., El Attar, M. Effect of Variable Frequency Drive and Pipe Materials on Guava Juice Flow. Arab Universities Journal of Agricultural Sciences, 2022; 30(1): 29-41. doi: 10.21608/ajs.2022.115676.1453
Effect of Variable Frequency Drive and Pipe Materials on Guava Juice Flow
1Agricultural Engineering Department, Faculty of Agriculture, Ain Shams University, Cairo, Egypt
2Food Science Department, Faculty of Agriculture, Ain Shams University, Cairo, Egypt
Abstract
In this study, a designed variable frequency drive (VFD) was used to control a single-phase induction motor’s speed to pump guava juice at two solid concentrations (9°Bx and 11°Bx). Next, the pressure drop was measured in stainless-steel pipes of three diameters. The pressure drop percentage difference before and after using the VFD at varied flow rates with 10 repetitions at 5 min intervals was evaluated. The pressure drop reduction range was 19.7%– 30.8% and 19.2 %–32.4% for the 9% and 11% solid concentrations respectively after using the VFD, which resulted in an average of 25.73% reductions in pressure drop and pump’s total head and driving power. The rheological properties of guava juice were investigated at various temperatures (5, 15, 25, 35, 55 and 75°C). From the results, all materials exhibited non-Newtonian pseudoplastic behavior at all temperatures and concentrations, and correlated well with the power law model, with flow behavior index (n) values less than unity for the 9% and 11% solid concentrations. The findings offer helpful information for predicting how heat variations during processing influence the behavior of guava juice concentrates.
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