Abstract
The surface heat flux measurement is challenging in numerous engineering applications such as aerospace engineering, internal combustion engines, advanced manufacturing processes is challenging due to rapid change in flow conditions. The coaxial thermocouples (CTs) have the response time in the range of milliseconds or less and they can capture the heating rate in impulsive ground-based conditions. The K, E, and J-type coaxial thermocouples were used to measure surface heat flux over a flat plat at different angles of attack 0°, 15°, 30°, and 45° exposing them into a convective based flow environment. The numerical analysis was performed by using software package Ansys-fluent for the experimental conditions to validate the experimental results. It has been noticed that, the average errors between experimental and numerical results are found in the range of ± 0.3% and ± 2.5% for transient temperature and surface heat flux respectively. This investigation is analogous to aerodynamics heating facilities and the results are confirmed that these in-house fabricated coaxial thermocouples are capable to measure surface heat flux at different location of the aerodynamic vehicles.
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Abbreviations
- AOA:
-
Angle of attack (°)
- c:
-
Specific heat (Jkg−1 K−1)
- k:
-
Thermal conductivity (Wm−1 K−1)
- \(q_{{\rm{s}}}\) :
-
Surface heat flux (Wm−2)
- t:
-
Time(s)
- T:
-
Temperature (K)
- S:
-
Sensitivity (µVK−1)
- \(T_{{\rm{s}}} \left( t \right)\) :
-
Temperature function of time (K)
- ρ :
-
Density (kgm−3)
- β :
-
Effective thermal product (Jm−2 s−0.5 K−1)
- τ :
-
Dummy time variable (s)
- \(\alpha_{0}\) :
-
Thermal coefficient of resistance (K−1)
- V :
-
Velocity (ms−1)
- P :
-
Pressure (kgm−1 s−2
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manjhi, S.K., Kumar, R. Assessments of surface heat flux from rapid temperature sensors at various angles of attack over a plate. J Therm Anal Calorim 147, 11493–11506 (2022). https://doi.org/10.1007/s10973-022-11341-4
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DOI: https://doi.org/10.1007/s10973-022-11341-4