Abstract
Numerical simulations of the flow field and heat transfer require the conjugate solution of the Navier–Stokes and energy equations, a highly compute-intensive process. Here a semi-analytical approach is proposed to solve the energy equation in curved pipes. It requires the flow velocity field, the wall temperature, and the temperature at only one point of the flow cross-section to provide the entire temperature field.
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Abbreviations
- a :
-
Duct radius, m
- d :
-
Pipe diameter, m
- D :
-
Thermal diffusivity, m2 s
- r :
-
Radial coordinate in the pipe cross section \( \sqrt {x^{2} + y^{2} } \)
- R :
-
Bend curvature radius, m
- T :
-
Temperature, K
- u, v :
-
Radial velocities in the pipe cross section, m s−1
- W :
-
Mean axial velocity, m s−1
- x, y :
-
Cartesian coordinates
- z :
-
Curvilinear coordinate
- ε :
-
Relative error between exact and approximate solution
- θ :
-
Curvature angle in the bend plane, rad
- μ :
-
Dynamic viscosity, Pa s
- υ :
-
Kinematic viscosity, m2 s−1
- ρ :
-
Density, kg m−3
- app :
-
Solution obtained from the present approach
- ext :
-
Exact solution
- c :
-
Mixer centerline
- i, j, k :
-
Iteration number
- w :
-
Wall
- 0:
-
Constant values
- ′:
-
First-degree partial derivative
- ″:
-
Second-degree partial derivative
- De :
-
Dean number = (W 2 a 3)/(Rυ 2)
- Re :
-
Reynolds number = Wd/υ
References
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Habchi, C., Khaled, M., Lemenand, T. et al. A semi-analytical approach for temperature distribution in Dean flow. Heat Mass Transfer 50, 23–30 (2014). https://doi.org/10.1007/s00231-013-1222-z
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DOI: https://doi.org/10.1007/s00231-013-1222-z