Philip Saffman
| Philip Saffman | |
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| Born | Philip Geoffrey Saffman 19 March 1931 Leeds, England |
| Died | 17 August 2008 (aged 77) Los Angeles, California, USA |
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| Doctoral advisor | George Batchelor |
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| Spouse | Ruth Arion (m. 1954) |
Philip Geoffrey Saffman FRS (March 19, 1931 – August 17, 2008) was a mathematician and the Theodore von Kármán Professor of Applied Mathematics and Aeronautics at the California Institute of Technology.
Saffman was born in Leeds, England, and educated at Roundhay Grammar School and Trinity College, Cambridge which he entered aged 15. He received his Bachelor of Arts degree in 1953, studied for Part III of the Cambridge Mathematical Tripos in 1954 and was awarded his PhD in 1956 for research supervised by George Batchelor.
Saffman started his academic career as a lecturer at the University of Cambridge, then joined King's College London as a Reader. Saffman joined the Caltech faculty in 1964 and was named the Theodore von Kármán Professor in 1995. According to Dan Meiron, Saffman “really was one of the leading figures in fluid mechanics,” and he influenced almost every subfield of that discipline. He is known (with his co-author Geoffrey Ingram Taylor) for the Saffman–Taylor instability in viscous fingering of fluid boundaries, a phenomenon important for its applications in enhanced oil recovery, and for the Saffman–Delbrück model of protein diffusion in membranes which he published with his Caltech colleague and Pasadena neighbor Max Delbrück. He made important contributions to the theory of vorticity arising from the motion of ships and aircraft through water and air; his work on wake turbulence led the airlines to increase the minimum time between takeoffs of airplanes on the same runway. Saffman also studied the flow of spheroidal particles in a fluid, such as bubbles in a carbonated beverage or corpuscles in blood; his work overturned previous assumptions that inertia was an important factor in these particles' motion and showed instead that Non-Newtonian properties of fluids play a significant role.
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