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ABSTRACT
The current study examines the aerothermal performance behaviors of a rectangular-channel with square-wing perforated V-type baffles (SW-PVBs). The SW-PVBs were attached to lower channel walls at five attack angles, θ = 0° (solid V-type baffle), 22.5°, 45°, 67.5° and 90°. The heat transfer and pressure drop results of a channel without SW-PVBs were performed to normalize the results of the SW-PVBs and evaluate thermal performance factors (TPFs). It can be observed that as the attack angles decreased, the heat transfer and pressure loss rose. Among the SW-PVBs that were tested, those characterized by θ = 22.5° exhibited the most significant improvement in heat transfer, whereas SW-PVBs with θ = 45° gave the highest thermal performance factors. Additionally, the SW-PVBs with θ = 45° offered the highest TPF, as high as 1.93.
Nomenclature
| a | = | height of square perforation, m |
| As | = | test section’s area, m2 |
| b | = | width of square perforation, m |
| c | = | a space between each square perforation, m |
| cp | = | specific heat, J/kgK |
| e | = | rib height, m |
| D | = | tube diameter, m |
| Dh | = | hydraulic diameter, m |
| f | = | friction factor |
| h | = | coefficient of heat transfer, W/m2K or baffle height, m |
| H | = | rectangular-channel height, m |
| = | heat flux, W/m2 | |
| = | heat gained, W | |
| I | = | current, Amps |
| k | = | thermal conductivity, W/mK |
| L | = | test section length, m |
| = | mass flow rate, kg/s | |
| Nu | = | Nusselt number |
| p | = | SW-PVB pitch length, m |
| P | = | static pressure, Pa] |
| ΔP | = | pressure drop, Pa |
| Re | = | Reynolds number |
| t | = | SW-PVB thickness, m |
| T | = | temperature, K |
| u | = | velocity, m/s1 |
| V | = | voltage, V |
| = | volumetric air flow rate, m3/s | |
| W | = | channel width, m |
| Greek symbols | = | |
| θ | = | square-wing attack angle |
| μ | = | viscosity, Ns/m2 |
| ρ | = | density, [kg/m3] |
| Subscripts | = | |
| b | = | bulk air |
| exp | = | experimental data |
| h | = | hydraulic |
| in | = | inlet air |
| m | = | mean |
| out | = | outlet air |
| pp | = | pumping power |
| pred | = | predicted data |
| s | = | smooth channel |
| w | = | heater plate wall |
| Abbreviations | = | |
| AR | = | aspect ratio |
| DVB | = | double-V baffle |
| LES | = | large eddy simulation |
| PIV | = | particle image velocimetry |
| RTD | = | resistance temperature detector |
| SW-PVB | = | square-wing perforated V-type baffle |
| TLC | = | thermochromic liquid crystal |
| TPF | = | thermal performance factor |
| VB | = | typical solid V-type baffle |
| WVG | = | winglet type vortex generators |
Acknowledgments
The research on “Research Title; “Evaluation of the thermal performance of a heat exchanger channel mounted with square-wing perforated V-type baffles” by King Mongkut’s Institute of Technology Ladkrabang (KMITL) has received funding support from the NSRF(FRB660065/0258-RE-KRIS/RE-KRIS/FF66/43)
Disclosure statement
No potential conflict of interest was reported by the author(s).