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Slotted plate device to measure the yield stress of biofluids
Author(s) -
De Kee Daniel,
Rice David,
Leissinger Cindy,
Meng Bin
Publication year - 2016
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22514
Subject(s) - yield (engineering) , rheometer , drag , computational fluid dynamics , materials science , stress (linguistics) , measure (data warehouse) , mechanics , mechanical engineering , structural engineering , composite material , computer science , engineering , physics , rheology , linguistics , philosophy , database
The slotted plate device by Zhu et al. 1,2 was redesigned to allow for the measurement of very low yield stress values that occur with complex biofluids. The newly built apparatus improves the force measurement with a balance of fine resolution and smooths the vertical motion via a lab jack. The slotted plate geometry was optimized to further reduce wall slip as well as pressure drag via computational fluid dynamics (CFD). To improve on the yield stress measurement accuracy, the new design has a large slot area ratio and a large number of slots, as well as sharp front and rear edges. Test results for a few structured fluids, including blood, are compared with yield stress values determined via a TA Instruments AR‐2000 rheometer.