Experimental Study on Microchannel with Addition of Microinserts Aiming Heat Transfer Performance Improvement
Abstract
:1. Introduction
2. Experiment
2.1. Experimental Set-Up
2.2. Scaling Parameters and Uncertainty
3. Results and Discussion
3.1. Pressure Drop Characteristics
3.2. Heat Transfer Characteristics
3.3. Overall Performance Evaluation
4. Conclusions
- The microinserts in the channel resulted in higher fluid outlet temperatures, causing lower base temperature when compared with the channel without microinserts.
- Microinserts performed in enhanced heat transfer, however, also caused a larger pressure drop. Pressure drops of the channel with microinserts were increased by a factor of 1.01–1.32 and 1.05–2.08, corresponding to 1 mm and 2 mm, respectively. The presence of microinserts resulted in increased flow resistance. It was obvious that temperature-dependent thermo-physical properties influenced the flow resistance.
- The heat transfer coefficients, effectiveness, NTU, and Nu of channels with microinserts were found to be increased, as compared to that of the channel without microinserts. The values of Nu were found to be larger by a factor of 1.01–1.08 in the case of the 1 mm and 1–1.07 for 2 mm channel sizes. It is indicated that the thermal performance of channels with microinserts improved. Microinserts effectively enhanced the heat transfer performance for both channel sizes.
- The performance evaluation criteria were employed to assess the overall performance of different channels. The results obtained by this method concluded that the overall performance of the channel with microinserts is better than that for the channel without microinserts for both channel sizes. It was found that microinserts result in the best overall performance at a lower Reynolds number. At a higher Reynolds number, microinserts improve the overall performance only marginally.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Nomenclature
Symbols | Descriptions | Unit |
As | Contact surface area of the fluid and microchannel | mm2 |
cp | Specific heat of water | J/kg-K |
Dh | Hydraulic diameter | mm |
f | Friction factor | |
H | Height of the microchannel | mm |
h | Heat transfer coefficient | W/m2-K |
kf | Thermal conductivity of fluid | J/s-m-K |
Ks | Solid thermal conductivity | J/s-m-K |
L | Length of the microchannel | mm |
m | Mass | kg |
Nu | Nusselt number | |
p | Pressure | Pa |
Re | Reynolds Number | |
T | Temperature | K |
TPF | Thermal performance factor | |
U | Fluid velocity | m/s |
W | Width of the microchannel | mm |
Δp | Pressure difference | |
ΔT | Temperature difference | |
Greek symbols | ||
ρ | Fluid density | kg/m3 |
µ | Dynamic viscosity | Pa-s |
Subscript | ||
f | Fluid | |
s | Solid |
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Kumar, S.R.; Singh, S. Experimental Study on Microchannel with Addition of Microinserts Aiming Heat Transfer Performance Improvement. Water 2022, 14, 3291. https://doi.org/10.3390/w14203291
Kumar SR, Singh S. Experimental Study on Microchannel with Addition of Microinserts Aiming Heat Transfer Performance Improvement. Water. 2022; 14(20):3291. https://doi.org/10.3390/w14203291
Chicago/Turabian StyleKumar, Shailesh Ranjan, and Satyendra Singh. 2022. "Experimental Study on Microchannel with Addition of Microinserts Aiming Heat Transfer Performance Improvement" Water 14, no. 20: 3291. https://doi.org/10.3390/w14203291
APA StyleKumar, S. R., & Singh, S. (2022). Experimental Study on Microchannel with Addition of Microinserts Aiming Heat Transfer Performance Improvement. Water, 14(20), 3291. https://doi.org/10.3390/w14203291