Wall Slip and Viscous Heating Effects on the Flow of Polypropylene/EP Rubber Blend in Capillary Rheometer

Sang-Yoon Kang; Krishnamurthy Jayaraman

Journal of Industrial and Engineering Chemistry, Vol.8, No.4, 370-374, July, 2002

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Wall Slip and Viscous Heating Effects on the Flow of Polypropylene/EP Rubber Blend in Capillary Rheometer

Sang-Yoon Kang^†, and Krishnamurthy Jayaraman¹

Department of Chemical and Biomolecular Engineering, Korea Adanced Institute of Science and Technology, Daejeon 305-701, Korea
¹Department of Chemical Engineering, Michigan State University, East Lansing, MI 48824, USA

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The wall slip flow behavior has been determined for a blend of polypropylene with EP rubber. Experiments and simulations are used to analyze the capillary flow data obtained from the several dies of different diameters. Mooney plots drawn from this data are strongly curved. This is attributed to viscous heating effects and to a more complex slip velocity relation for the blend. The relevant mass, momentum, and energy equations for flow of a power-law fluid through a capillary are solved numerically to incorporate the combined effects of slip and viscous heating, for fitting the capillary flow data.

Keywords:wall slip;viscous heating;Mooney plot;PP/EP blend

[References]

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[1] Hobbs SY, Polym. Eng. Sci., 36(11), 1489 (1996)

[2] Chang MCO, Int. Polym. Process., 11(1), 76 (1996)

[3] Heuzey MC, Dealy JM, Gao DM, Garcia-Rejon A, Int. Polym. Process., 12(4), 403 (1997)

[4] Lin YH, J. Rheol., 29(6), 605 (1985)

[5] Shidara H, Denn MM, J. Non-Newton. Fluid Mech., 48, 101 (1993)

[6] Hatzikiriakos SG, Dealy JM, J. Rheol., 36(4), 703 (1992)

[7] Kazatchkov IB, Hatzikiriakos SG, Stewart CW, Polym. Eng. Sci., 35(23), 1864 (1995)

[8] Rosenbaum EE, Hatzikiriakos SG, AIChE J., 43(3), 598 (1997)

[9] Mourniac P, Agassant JF, Vergnes B, Rheol. Acta, 31, 565 (1992)

[10] Malkin AY, Baranov AV, Vikulenkova ME, Rheol. Acta, 32, 150 (1993)

[11] Kamal MR, Nyun H, Polym. Eng. Sci., 20(2), 109 (1980)

[12] Warren RC, Rheological Measurement, A.A. Collyer and D.W. Clegg Ed., pp. 119, Elsevier, London (1988)

[13] Winter HH, Adv. Heat Transfer, 13, 205 (1977)

[14] Hatzikiriakos SG, Dealy IM, J. Rheol., 35, 497 (1991)