1. Flow of viscous liquid is always accompanied by heat output because work must be done and dissipated in creating flow, therefore, flow cannot be isothermal in principle. However, this effect cannot be weak and the basic theory of capillary viscometry neglects this influence. Non-isothermal effects can be essential in flow of high viscosity liquids, and the analysis of this problem is a separate task in the theory of capillary viscometry.
2. Hagen (1839) and independently Poiseuille (1846) have experimentally shown that volumetric flow rate is proportional to R4. Eq. 5.2.10 was later independently obtained by Weidman (1856) and Hagenbach (1860).
3. An engineering method for calculating the flow of polymers in channels of noncircular cross section
4. Über die Viskosität und Elastizität von Solen
5. A procedure to determine the viscosity function from experimental data of capillary flow