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Nonisothermal laminar contracted flow
Author(s) -
Christiansen E. B.,
Kelsey S. J.
Publication year - 1972
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690180408
Subject(s) - laminar flow , mechanics , newtonian fluid , tube (container) , thermodynamics , coaxial , flow (mathematics) , materials science , physics , composite material , electrical engineering , engineering
Abstract Temperature and velocity profiles and pressure losses were computed for laminar, temperature‐dependent Newtonian flow from a stream tube through an abrupt contraction into and through the entrance region of a smaller coaxial tube, in which the fluid was cooled or heated at constant wall temperature. The equations of motion and energy, including axial diffusion and viscous dissipation, were solved numerically for diameter ratios of one and two, a practical temperature range, and N Pe and N Re up to 100. Entrance temperatures and velocities are far from uniform, and pressure losses are greater than those computed using simplified equations and uniform entrance temperatures and velocities.