Abstract
The purpose of this study is to experimentally and numerically investigate the effects of rotation number on heat transfer and fluid flow in a three-pass serpentine passage with lateral outflow. In the present study, the rotation number varies from 0 to 0.09, and the inlet Reynolds number is 5000. The heat transfer coefficient distribution of the three-pass serpentine passage is measured using the transient liquid crystal technique. The current work fills the research gap of the effect of rotation number on heat transfer distribution in a three-pass serpentine passages with lateral outflow. The results of this study show that the span-wise-averaged Nusselt numbers in the region of l/d < 16 and l/d > 33.6 increase monotonically with the rotation number increasing, particularly in l/d = 6.4, with a maximum increase of 58.5%. However, the rotation reduces the Nusselt numbers of the middle passage by between 2.6 and 7.3% when the rotation number increases from 0 to 0.06. The area-averaged Nusselt numbers rapidly decrease in the area of Ai = 4; this phenomenon is more obvious at higher rotation numbers, and the maximum decrease is 34.6%. The pressure coefficient in the region of l/d < 14 tends to increase gradually along the flow direction when Ro = 0.09. The rotation changes the flow direction and shrinks the vortex size in the lateral-outflow passage. Accordingly, the pressure coefficient rapidly increases by 74.1% in the lateral-outflow passage when Ro = 0.06 and Ro = 0.09.
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Abbreviations
- D f :
-
Hole diameter (m)
- X :
-
Coordinate direction (m)
- T :
-
Temperature (K)
- A :
-
Area of inlet (m2)
- d :
-
Hydraulic diameter of channel inlet (m)
- l :
-
Distance from the channel inlet
- v :
-
Flow velocity (m s−1)
- v 0 :
-
Flow velocity of inlet (m s−1)
- R :
-
Rotation radius (m)
- M inlet :
-
Inlet mass flow rate of inlet (kg s−1)
- M i :
-
i outlet mass flow rate (kg s−1)
- Re:
-
Reynolds number
- Rew :
-
Rotation Reynolds number
- Ro:
-
Rotation number
- T 0 :
-
Initial temperature (K)
- T w,av :
-
Averaged wall temperature (K)
- P :
-
Pressure (Pa)
- P 0 :
-
Static pressure of inlet (Pa)
- Nu:
-
Nusselt number
- C p :
-
Pressure coefficient
- q :
-
Heat flux (W m−2)
- c :
-
Specific heat capacity (J kg−1 K−1))
- h :
-
Heat transfer coefficient (W m−2 K−1)
- Cal:
-
Calculation
- Exp:
-
Experiment
- τ :
-
Color change time (s)
- μ :
-
Mainstream viscosity coefficient (Pa s)
- λ :
-
Heat conductivity coefficient (W m−1 K−1)
- ρ :
-
Mainstream density (kg m−3)
- ω :
-
Rotation rate (rad s−1)
- θ :
-
Excess temperature (K)
- g:
-
Mainstream
- inlet:
-
Channel inlet
- w:
-
Wall
- aw:
-
Adiabatic wall
- ave:
-
Average
- cor:
-
Corrector
- i:
-
Test point number
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Acknowledgements
The authors acknowledge gratefully the financial support from the National Natural Science Foundation of China (Grant No. 51776173) and National Science and Technology Major Project (Grant No. 2017-Ш-0003-0027) and the Innovation Capacity Support Plan in Shaanxi Province of China (Grant No. 2019KJXX-065).
Funding
This study was funded by National Natural Science Foundation of China (Grant No. 51776173) and National Science and Technology Major Project (Grant No. 2017-Ш-0003-0027) and the Innovation Capacity Support Plan in Shaanxi Province of China (Grant No. 2019KJXX-065).
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Zhang, Bl., Zhu, Hr. & Liu, Cl. Effects of rotation number on heat transfer and fluid flow in a three-pass serpentine passage with lateral outflow. J Therm Anal Calorim 143, 309–325 (2021). https://doi.org/10.1007/s10973-019-09186-5
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DOI: https://doi.org/10.1007/s10973-019-09186-5