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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.146

ISSN Print: 2169-2785
ISSN Online: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2018025429
pages 107-112

PRESSURE DEPENDENCE OF VISCOSITY: A NEW GENERAL RELATION

Jürn W. P. Schmelzer
Rostock University, Institute of Physics, Polymer Physics Group, Rostock, D-18051, Germany
Alexander S. Abyzov
National Science Center–Kharkov Institute of Physics and Technology, Kharkov, 61108, Ukraine

ABSTRACT

We reanalyze the pressure dependence of viscosity of liquids of constant composition under isothermal conditions. Based exclusively on very general considerations concerning the relationship between viscosity and free volume of the liquid, we show that viscosity increases, as a rule, with increasing pressure. The conditions are specified at which such normal behavior is replaced by an anomalous decrease of viscosity with pressure. A variety of relations employed frequently in the description of the pressure dependence of viscosity are shown to be special cases of the general relation derived.