Gas Turbine Intercoolers: Introducing Nanofluids—A Mini-Review
Abstract
:1. Introduction
- The gas turbine industry has not yet opened up to this sort of advanced working fluids;
- The researchers working on the nanofluid field may have preferred to use the term HE to refer to intercoolers, as there are 1313 documents (1996–2020) on ‘Heat exchanger nanofluid’ in the Scopus database;
- The term ‘Nanofluid’ is often replaced by other terms, such ‘Suspension’, ‘Dispersion’, and ‘Mixture’; and/or
- Other publications do exist but are not covered by the explored search engines.
2. Gas Turbines Intercooled System and Their Designs
3. Nanofluids Types and Fabrication Processes
4. Dispersion Stability and Thermophysical Properties
5. Utilization of Nanofluids in Intercoolers
6. Discussion and Future Directions
- A feasibility study on utilizing different types of nanofluids needs to be conducted. It should consider the net cost of the starting materials (e.g., NPs and basefluids) against the gained performance enhancement of the system. At this point, there does not exist any such study on intercooler HEs [85].
- One of the most important aspects that is associated with the use of nanofluids is their environmental impact. This includes the different stages that the nanofluids undergo, such as NPs synthesis, nanofluids production, suspension transfer and employment in the system, and disposal. Currently, such studies are very limited, and at the same time, not available for intercoolers [86].
- Further investigation in terms of both experimental and theoretical approach should be conducted on the effect of employing nanofluids in gas turbine intercooler systems. This is because the current literature is not adequate for introducing such heat transfer fluids for the industry.
- In terms of dispersion stability, the chemical routes used for improving the stability of nanofluids, such as surfactants and NPs functionalization, would also cause their effective thermal conductivity to reduce [48,87]. The level of degradation in such thermal property is crucial when it comes to their thermal transport capability, and hence more investigations are needed in this area.
- Generally, in any application of elevated temperature, the working fluid tends to form fouling layers on the attached surfaces. Such layer formation is more rapidly seen when using nanofluids except for the thin film in such case would mostly contain deposited NPs that were initially hosted by the working fluid [2]. Researchers [88,89,90] have reported that the wettability of the surface changes with the type of film formed, layer thickness, and temperature of the attached fluid. Understanding how nanofluids fouling affect the wettability of different surfaces is important as it is directly linked to the pumping power required by the system, and hence the overall efficiency of the system.
7. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Nomenclature
CNT | Carbon nanotube |
EG | Ethylene glycol |
Temperature fitting parameter | |
HE | Heat exchanger |
Thermal conductivity (W/m.K) | |
Length of nanoplatelet (nm) | |
ND | Nanodiamond |
NP | Nanoparticle |
P&FHE | Plate-and-frame heat exchanger |
PFHE | Plate-fin heat exchanger |
PHE | Plate heat exchanger |
Radius (nm) | |
Impact of interfacial resistance | |
Re | Reynolds number |
SANSS | Submerged arc nanoparticles synthesis system |
SS | Stainless steel |
Mixture temperature (°C or K) | |
Average flatness ratio | |
Nanolayer Thickness (nm) | |
VEROS | Vacuum evaporation onto a running oil substrate |
vol. % | Scanning electron microscope |
wt. % | Weight percentage |
Greek letters | |
Nanoplatelet thickness (nm) | |
Dynamic viscosity (kg/m.s) | |
Subscripts | |
Basefluid | |
Effective | |
Nanoparticles | |
Particle equivalent |
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Nanofluid Fabrication Methods | ||
---|---|---|
Production Route | Single-step | Two-step |
Advantages |
|
|
Disadvantages |
|
|
Particles Dispersion |
|
|
Property | Method | Device/Equation * | Source |
---|---|---|---|
Effective thermal conductivity | Experimental |
| [50,51,52,53] |
Formula * | [54] | ||
[55] | |||
[56] | |||
Effective viscosity | Experimental |
| [57,58,59,60] |
Formula * | [61] | ||
[62] | |||
[63] |
Researcher (/s) | NPs | Basefluid | Concentration | Additional Information | Finding |
---|---|---|---|---|---|
Yu et al. [64] | Graphene | EG | 2–5 vol. % | Two-step controlled temperature fabrication from 10 to 60 °C | The 5 vol. % suspension produced at 60 °C was 86% higher in thermal conductivity than pure EG at similar temperature. |
Ghozatloo et al. [66] |
| Water | 0.01–0.05 wt. % |
|
|
Zhang et al. [67] |
| Ionic liquid | – | Dispersion of particles was done through two stages. The first was through magnetic stirring (15 min), and the second by ultrasonication (1 h). |
|
Timofeeva et al. [75] | Silicon carbide | EG–water | – |
|
|
Timofeeva et al. [76] | f-graphite nanoplatelets | EG–water | Up to 5 wt. % |
| Increasing the NPs thickness and diameter have caused the effective thermal conductivity to improve up to 80% over the basefluid but had also raised the effective viscosity 100 times more. |
Akhavan-Zanjani et al. [77] | Graphene | Water | 0.005–0.02 wt. % |
| 0.02 wt. % nanofluid showed an increase of 4.95% in viscosity compared to the basefluid. |
Li et al. [78] | Silicon dioxide | Liquid paraffin–oleic acid | 0.005–5 wt. % |
| significant increases in the 5 wt. % nanofluids viscosity over the basefluid, precisely 331% (at 25 °C) and 495% (at 70 °C). |
Scholar (/s) | NPs Type | Basefluid | NPs Concentration (vol. %) | Performance Enhancement | Additional Notes |
---|---|---|---|---|---|
Zhao et al. [79,80] |
| Water | 1–5 | Pumping power
| The study was performed theoretically on a marine gas turbine system that is integrated with an intercooler HE. |
Masoud Hosseini et al. [81] |
| Water | 0.0055–0.278 | Heat transfer rate 10.3% | Theoretical modelling of an industrial LPG absorber tower utilizing CNTs nanofluids. |
Estellé [82] |
| Water | 0.0055–0.278 | – | The author commented on the previous work of Masoud Hosseini et al. [81], where he pointed out that the effective viscosity equation used in the modeling process was inappropriate for the task. This is because the researchers used the formula for dispersed Al2O3 NPs instead of CNTs, which will only affect the results of nanofluids with ≥0.111 vol. % |
Chintala et al. [83] |
| Water | 0.5–1 | Intercooler efficiency 36.1% at 4 bar compressor load | Experimental investigation on a double stage air compressor fitted with an intercooler HE. |
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Alsayegh, A.; Ali, N. Gas Turbine Intercoolers: Introducing Nanofluids—A Mini-Review. Processes 2020, 8, 1572. https://doi.org/10.3390/pr8121572
Alsayegh A, Ali N. Gas Turbine Intercoolers: Introducing Nanofluids—A Mini-Review. Processes. 2020; 8(12):1572. https://doi.org/10.3390/pr8121572
Chicago/Turabian StyleAlsayegh, Ali, and Naser Ali. 2020. "Gas Turbine Intercoolers: Introducing Nanofluids—A Mini-Review" Processes 8, no. 12: 1572. https://doi.org/10.3390/pr8121572
APA StyleAlsayegh, A., & Ali, N. (2020). Gas Turbine Intercoolers: Introducing Nanofluids—A Mini-Review. Processes, 8(12), 1572. https://doi.org/10.3390/pr8121572