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Preparation, Characterization, Properties, and Application of Nanofluid

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Abstract

The book started with the introduction of colloidal systems and discussed its relation with nanofluids in Chapter 1. Available preparation methods of nanofluids are included in Chapter 2. Special emphasize on how to prepare stable nanofluid and the impact of ultrasonication power on nanofluid preparation are considered. Nanofluid characterization and stability measurement technics are discussed in Chapter 3. Thermophysical properties of nanofluids as thermal conductivity, viscosity, density, specific heat, and surface tension including the figure of merit of the properties are discussed in Chapter 4. Also, the effect of different parameters like particle type, size, concentration; liquid type and temperature on these thermophysical properties are discussed based on experimental results. Rheological behaviours and optical properties of nanofluids are included (as two separate chapters (Chapter 5 and 6, respectively) other than thermophysical properties). Moreover, the effect of different parameters on these properties are also discussed. The available model and correlations used for nanofluid property calculation are included in Chapter 7. Also, the numerical formulas, which are used to calculate performance parameters like heat transfer coefficient, pressure drop, energy, etc. of thermal systems are discussed. The numerical analysis included different types of heat exchangers and solar collector’s performance improvement by using nanofluid properties. Potential application (existing and promising) of nanofluids are discussed in Chapter 8.
Preparation,
Characterization, Properties,
and Application of
Nanofluid
Preparation,
Characterization, Properties,
and Application of
Nanofluid
I.M. Mahbubul
Center of Research Excellence in Renewable Energy (CoRERE),
Research Institute, King Fahd University of Petroleum & Minerals (KFUPM),
Dhahran, Saudi Arabia
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ISBN: 978-0-12-813245-6
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Contents
Acknowledgments ix
1 Introduction to Nanofluid 1
1.1 Introduction 1
1.2 Colloid 1
1.3 Nanofluid 5
1.4 Scope 11
References 11
2 Preparation of Nanofluid 15
2.1 Introduction 15
2.2 One-Step Method 16
2.3 Two-Step Method 23
2.4 Comparison of One-Step and Two-Step Methods 39
References 41
3 Stability and Dispersion Characterization of Nanofluid 47
3.1 Introduction 47
3.2 Ultrasonication 48
3.3 Surfactant 92
3.4 pH Control 101
References 107
4 Thermophysical Properties of Nanofluids 113
4.1 Introduction 113
4.2 Thermal Conductivity 113
4.3 Viscosity 132
v
4.4 Density 152
4.5 Specific Heat 159
4.6 Surface Tension 173
References 184
5 Rheological Behavior of Nanofluid 197
5.1 Introduction 197
5.2 Measurement Method 198
5.3 Rheological Model 201
5.4 Rheology Analyses 212
5.5 Concluding Remarks 226
References 227
6 Optical Properties of Nanofluid 231
6.1 Introduction 231
6.2 Absorption 234
6.3 Transmittance 248
6.4 Extinction Coefficient 259
6.5 Scattering Coefficient 268
6.6 Concluding Remarks 269
References 270
7 Correlation and Theoretical Analysis of Nanofluids 273
7.1 Introduction 273
7.2 Thermophysical Properties Calculation 273
7.3 Performance Parameter Calculation 292
7.4 Figure of Merit Analysis 308
References 309
8 Application of Nanofluid 317
8.1 Introduction 317
8.2 Electronics Cooling 317
vi Contents
8.3 Solar Collector 323
8.4 Heat Exchanger 327
8.5 Engine Cooling 331
8.6 Refrigerator 335
8.7 Machining 338
References 343
Nomenclature 351
Index 355
Contents vii
Acknowledgments
In the name of Allah, The Beneficent, The Merciful, I would like to express my utmost
gratitude and thanks to the almighty Allah (s.w.t.) for the help and guidance that he has
given me through all these years. My deepest appreciation is to my family for their blessings
and supports.
I would like to acknowledge the support provided by the Deanship of Scientific Research
(DSR) at King Fahd University of Petroleum and Minerals (KFUPM) for funding the writing
of this book through project No. BW161002.
Some experimental works were previously conducted in University of Malaya under the
support of the High Impact Research MoE (Ministry of Education Malaysia), grant: UM.C/
625/1/HIR/MoE/ENG/40 (D000040-16001).
I wish to thank Dr. Saidur Rahman, Dr. Amalina Binti Muhammad Afifi, Dr. Fahad
Abdulaziz Al-Sulaiman, my other colleagues and researchers for their kind support.
I appreciate the cooperation of the Elsevier team: the Acquisition Editor (Mr. Simon Holt),
Editorial Project Managers (Ms. Leticia Lima, Ms. Anna Valutkevich), Project Manager-
Production (Mr. Kamesh Ramajogi), and Copyrights Coordinator (Ms. Sandhya Narayanan).
I would like to extend my thanks to Elsevier and other publishers for granting the neces-
sary permission/license to reuse (reprint/adaptation) the copyrighted items.
ix
... This restricts the thermal phenomena, resulting in poor thermal efficiencies and exergetic outputs. When nanofluids are designed to have high thermal conductivity nanoparticles, they exhibit higher thermal conductivities than those of conventional heat transfer fluids (Mahbubul 2019). ...
... Thermal conductivity, viscosity, density, specific heat, and surface tension are considered some main thermophysical properties of nanofluids. Various parameters like nanoparticle type, size, and shape, volume concentration, fluid temperature, and nanofluid preparation method have effect on thermophysical properties of nanofluids [12]. ...
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... The two most frequent approaches are the bottom-up technique, which combines nanoparticle creation and dispersion into the host fluid, and the top-down strategy, which disperses pre-made nanoparticles in the base fluid (Chamsa-ard et al., 2017). Although the bottom-up technique effectively improves stability and minimizes particle clustering, it is complex, costly, and limited in production at smaller scales (Asadi et al., 2019;Mahbubul, 2018). The two-step procedure, in which dry nanoparticles are dispersed in the host fluid, on the other hand, is preferable due to its reduced processing expenses and nanoparticle availability (Esfe and Afrand, 2019). ...
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... Ultrasonication is capable to break down particle aggregates, however, agglomeration can still occur in a prolonged ultrasonication process. This means that the ultrasonication time and power determine the uniformity of nanocomposite particle size [41]. ...
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This study aims to evaluate the radioprotective effects of liposomes encapsulating curcumin (Lip-CUR), silibinin (Lip-SIL), α-tocopherol (Lip-TOC), quercetin (Lip-QUE) and resveratrol (Lip-RES) in alleviating the adverse effects of ionising irradiation on human lymphoctyes and skin cells in radiotherapy. Liposomes encapsulating the above natural radioprotectants (Lip-NRPs) were prepared by the film hydration method combined with sonication. Their radioprotective effects for the cells against X-irradiation was evaluated using trypan-blue assay and γ-H2AX assay. All prepared Lip-NRPs had a mean diameter less than 240 nm, polydispersity index less than 0.32, and zeta potential more than -23 mV. Among them, the radioprotective effect of Lip-RES was lowest, while that of Lip-QUE was highest. Lip-SIL also exhibited a high radioprotective effect despite its low DPPH-radical scavenging activity (12.9%). The radioprotective effects of Lip-NRPs do not solely depend on the free radical scavenging activity of NRPs but also on their ability to activate cellular mechanisms.
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