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Friction losses in valves and fittings for liquid food products

Paper ID Volume ID Publish Year Pages File Format Full-Text
19383 43062 2011 8 PDF Available
Title
Friction losses in valves and fittings for liquid food products
Abstract

Data on pressure drop were obtained in stainless steel, sanitary fittings and valves during laminar and turbulent flow of egg yolk, coffee extract, blackberry juice and concentrated milk, which were selected as typical liquid food products. The rheological properties of these fluids were obtained from previously published studies and the power-law model provided the best description of the rheological behavior of these liquids. Friction losses were measured in fully and partially open butterfly, seat, no-return and ball valves, bends, tees and unions. Values of loss coefficients (kf) were calculated and correlated as a function of the generalized Reynolds number by the two-k method. The model adjustment was satisfactory, being better in the laminar flow range (0.884 ≤ r2 ≤ 0.999) than in the turbulent one (0.751 ≤ r2 ≤ 0.989). In order to test the adequacy of the results that are needed to predict loss coefficients during flow of liquid food products, measurements were carried out during the flow of orange juice in the same temperature range at which the correlations were obtained. The flow of coffee extract and egg yolk at different temperatures than those of the correlations were also analyzed. Comparison between experimental and predicted loss coefficients showed very good agreement.

Research highlights▶ Friction losses were measured in sanitary valves and fittings for liquid food flow. ▶ Loss coefficients were correlated with the generalized Reynolds by the 2-k method. ▶ Experimental results for other fluids and flow conditions agreed with predictions.

Keywords
Pressure drop; Non-Newtonian liquids; Friction factors; Loss coefficients
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 89, Issue 4, October 2011, Pages 375–382
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us