ABSTRACT
Biegeleisen in collaboration with Jerzy Bukowski (1902-1982) were among the first realizing the relevance of the Reynolds number for pipe flow. In their 1914 paper they first reviewed a number of papers relating to pressurized pipe flow, for both laminar and turbulent conditions. They discussed the effects of temperature, pipe diameter and average velocity on the head loss in the turbulent regime. Notably, the viscous effect was not directly included at that time. The surface roughness effect was included by roughness numbers, as proposed by most investigators, starting from Henry Darcy (1803-1858) and Henry Bazin (1829-1917) in their notable 1865 research. Biegeleisen und Bukowski proposed some equations for the conditions described. They also presented diagrams to facilitate computations in engineering applications. Besides this work, Biegeleisen eventually developed into an expert of heat engineering, as from 1900 often installed in houses. These improvements of daily life were based on the influence of Hermann Rietschel (1847-1914), the first professor of ventilation and heating techniques of the German speaking countries. Other works of Biegeleisen were directed to the optimum diameter in piping systems, in which his 1914 research was used as the basis of computation.
