A single comprehensive equation is developed for the rate of heat and mass transfer from a circular cylinder in crossflow, covering a complete range of Pr (or Sc) and the entire range of Re for which data are available. This expression is a lower bound (except possibly for RePr < 0.2); free-stream turbulence, end effects, channel blockage, free convection, etc., may increase the rate. In the complete absence of free convection, the theoretical expression of Nakai and Okazaki may be more accurate for RePr < 0.2. The correlating equation is based on theoretical results for the effect of Pr in the laminar boundary layer, and on both theoretical and experimental results for the effect of Re. The process of correlation reveals the need for theoretical results for the effect of Pr in the region of the wake. Additional experimental data for the effect of Pr at small Pe and for the effect of Re during the transition in the point of separation are also needed.

A Correlating Equation for Forced Convection From Gases and Liquids to a Circular Cylinder in Crossflow

Numerical solution to the Navier-Stokes equations for laminar natural convection about a horizontal isothermal circular cylinder

Laminar combined convection from a horizontal cylinder—Parallel and contra flow regimes

A theoretical study of laminar mixed convection from a horizontal cylinder in a cross stream

Contributions to the acoustic signal sensitivity of fiber distributed-feedback (DFB) lasers in air are investigated both theoretically and experimentally The theoretical results show that the dominant contribution to the laser frequency shift comes from adiabatic temperature shifts in the surrounding air at lower frequencies and from pressure at higher frequencies The transition frequency was found to be between 5 and 20 kHz, depending on the elastic boundary conditions of the fiber laser The acoustically induced frequency shifts of two fiber DFB lasers were measured, and the sensitivities varied from 061 MHz/Pa at a 100-Hz acoustic frequency to 034 kHz/Pa at a 15-kHz acoustic frequency

Nakai Seiichi

Papers

Heat transfer from a horizontal circular wire at small reynolds and grashof numbers-ii