SR26  Reologia    Titulo: BULK CHARACTERISTICS OF SOME VARIABLE VISCOSITY POLYMER SOLUTIONS IN TURBULENT PIPE FLOW   Resumo : ABSTRACT. AS PART OF A RESEARCH PROGRAMME ON WALL-FREE TURBULENT FLOWS OF NON-NEWTONIAN FLUIDS, AQUEOUS SOLUTIONS OF THREE DIFFERENT POLYMERS HAVE BEEN EXTENSIVELY INVESTIGATED IN TERMS OF THEIR FRICTIONAL PRESSURE DROP VERSUS FLOW RATE CHARACTERISTICS, AFTER A CAREFULL PROCESS OF FLUID SELECTION AND RHEOLOGICAL CHARACTERISATION REPORTED ELSEWHERE (PEREIRA AND PINHO, 1994 AND COELHO AND PINHO, 1998). ALL SOLUTIONS, AND IN PARTICULAR THOSE OF CMC AND MORE SO OF XANTHAN GUM, EXHIBITED DRAG REDUCTION. THE TOTAL DRAG REDUCTION WAS SEPARATED INTO SHEAR-THINNING (DRV) AND ELASTIC (DRE) CONTRIBUTIONS, WITH DRV REACHING A MAXIMUM OF ABOUT 30% OF THE TOTAL FOR THE THICKEST XANTHAN GUM SOLUTIONS. KEYWORDS: DRAG REDUCTION; PIPE FLOW     Autores : Pereira, Américo Sá Pinho, Fernando Tavares     Trabalho Completo :   COBEM99 | Comissão  Organizadora | Palestras | Sessões Técnicas | Autor | Simpósios e Sessões Especiais | Revisores |  Título  dos  Trabalhos | Local