Reynolds, Osborne

born Aug. 23, 1842, Belfast, Ire.

died Feb. 21, 1912, Watchet, Somerset, Eng.

British engineer and physicist.

Educated at Cambridge University, he became the first professor of engineering at the University of Manchester (1868). Best known for his work in hydraulics and hydrodynamics, he formulated the law of resistance in parallel channels (1883), the theory of lubrication (1886), and the standard mathematical framework used in turbulence work (1889). He studied wave engineering and tidal motions in rivers and made pioneering contributions to the concept of group velocity. The Reynolds stress in fluids with turbulent motion and the Reynolds number are named for him.

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▪ British engineer and physicist

born Aug. 23, 1842, Belfast, Ire.

died Feb. 21, 1912, Watchet, Somerset, Eng.

      British engineer, physicist, and educator best known for his work in hydraulics and hydrodynamics.

      Reynolds was born into a family of Anglican clerics. He gained early workshop experience by apprenticing with a mechanical engineer, and he graduated at Queens' College, Cambridge, in mathematics in 1867. In 1868 he became the first professor of engineering at Owens College, Manchester, a position he held until his retirement in 1905. He became a fellow of the Royal Society in 1877 and received a Royal Medal in 1888.

      Though his earliest professional research dealt with such properties as magnetism, electricity, and heavenly bodies, Reynolds soon began to concentrate on fluid mechanics. In this area he made a number of significant contributions. His studies of condensation and heat transfer between solids and fluids brought radical revision in boiler and condenser design, while his work on turbine pumps permitted their rapid development. He formulated the theory of lubrication (1886) and in 1889 developed the standard mathematical framework used in turbulence work. He also studied wave engineering and tidal motions in rivers and made pioneering contributions to the concept of group velocity. Among his other contributions were the explanation of the radiometer and an early absolute determination of the mechanical equivalent of heat. His paper on the law of resistance in parallel channels (1883) is a classic. The “Reynolds stress” in fluids with turbulent motion and the “Reynolds number” used for modeling in fluid flow experiments are named for him.

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