RIBBING INSTABILITY OF A TWO-ROLL COATER: NEWTONIAN FLUIDS
- 1 January 1980
- journal article
- research article
- Published by Taylor & Francis in Chemical Engineering Communications
- Vol. 5 (1-4) , 73-83
- https://doi.org/10.1080/00986448008935954
Abstract
Data are presented for the critical conditions at which the ribbing instability appears on the surface of a Newtonian liquid film emerging from the nip between two rotating rolls. Data are obtained over two decades in Capillary number (Ca = μU/σ) for values of H0/R in the range 3 × 10−3 to 5 × 10−2. The critical Capillary number is found to be given by the expression $ Data are compared to the predictions that follow from a theory due to Savage, and agreement is found to be poor.Keywords
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