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ABSTRACT
This study prepares an experimental examination of thermal and hydraulic analysis of an absorber plate integrated with different arrangements of twisted turbulators, including longitudinal, transversal, and oblique orientations. These arrangements are considered for both the integral and the interrupted turbulators over Reynolds number range from 9174 to 55048. Nu ratio and f ratio range from 1.15–2.21 and 1.73–7.79, respectively. The interrupted turbulators with oblique arrangements with the attach angles of 30° and 60° come in the second and third places, respectively, and the maximum criterion value in the latter cases is 1.29 and 1.21.
Acknowledgments
Miss. A. Salimi is acknowledged for her contribution to this work.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Nomenclature
| Ac | = | cross-section area (m2) |
| At | = | total area (m2) |
| BP | = | blowing power (W) |
| cp | = | specific heat (J kg−1 K−1) |
| Dh | = | hydraulic diameter (m) |
| f | = | friction factor |
| h | = | heat transfer coefficient (W m−2 K−1) |
| k | = | thermal conductivity (W m−1 K−1) |
| L | = | flow length (m) |
| m | = | mass flow rate (kg s−1) |
| n | = | independent parameter |
| Nu | = | Nusselt number |
| R | = | uncertainty of a parameter |
| Re | = | Reynolds number |
| ∆p | = | pressure drop (Pa) |
| Pr | = | Prandtl number |
| Q | = | heat transfer rate (W) |
| T | = | temperature (K) |
| ∆T | = | temperature difference (K) |
| v | = | inlet velocity (m s−1) |
Greek symbols
| ρ | = | density (kg m−3) |
| μ | = | dynamic viscosity (Pa s) |
| ξ | = | performance criterion |
Subscripts
| a | = | average |
| w | = | wall |
| b | = | bulk |
| in | = | inlet |
| m | = | mean |
| out | = | outlet |
Acronyms
| AC | = | alternating current |
| AP | = | absorber plate |
| MDF | = | medium density fiberboard |
| PTEF | = | polytetrafluoroethylene |
| RTD | = | resistance temperature detectors |
| SAH | = | solar air heater |
| TT | = | twisted turbulator |
Notes
1 Resistance Temperature Detectors.
2 Medium Density Fiberboard.
3 Polytetrafluoroethylene.
4 Alternating Current.