Abstract
Modeling fluid flows is a general procedure to handle engineering problems. Here we present a systematic study of the flow and heat transfer around a circular cylinder by introducing a new representative appropriate drag coefficient concept. We demonstrate that the new modified drag coefficient may be a preferable dimensionless parameter to describe more appropriately the fluid flow physical behavior. A break in symmetry in the global structure of the entire flow field increases the difficulty of predicting heat and mass transfer behavior. A general simple drag model with high accuracy is further developed over the entire range of Reynolds numbers met in practice. In addition, we observe that there may exist an inherent relation between the drag and heat and mass transfer. A simple analogy model is established to predict heat transfer behavior from the cylinder drag data. This finding provides great insight into the underlying physical mechanism.
Highlights
The fluid dynamic drag [13,14,15], active and passive methods for drag reduction [16,17,18], boundary layer flow [19], flow-induced vibration [5], behavior of turbulent fluid motion [20], and instability in the wake shear layer [21,22,23] are of interest in numerous fields
The flow over bluff bodies like spheres [24,25,26] and circular cylinders [27,28,29,30] is a classical problem in fluid mechanics
Duan al. [7] investigated first proposed the appropriate drag coefficient to replace the inertia type definition proposed by heat transfer past a sphere, and they first proposed the appropriate drag coefficient to replace the Sir inertia type definition proposed by Sir Isaac Newton
Summary
Flow over an object is omnipresent both in nature [1,2,3] and in many engineering applications [4,5,6]. Owing to its practical importance in engineering applications and theoretical significance in understanding fundamental fluid mechanics, the flow over a circular cylinder has attracted extensive study interest from both scientists and engineers. The flow and heat transfer characteristics of circular cylinders in cross flow have been the subject of many theoretical, experimental, and numerical studies; a large number of results exist and are available in the literature
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