Experimental investigation of diameter effect on heat transfer performance and pressure drop of TiO2–water nanofluid

Arani, Ali Akbar Abbasian; Amani, J.

doi:10.1016/j.expthermflusci.2012.08.014

Cited by 172 publications

(33 citation statements)

References 46 publications

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“…where M is molecular weight of the base fluid, N is the Avogadro number, and q fo is the density of base fluid at standard temperature 293 K. Accordingly, and basing on water as base fluid, the value of d f is obtained: [38] argued that his model exhibits an accuracy of (1.85% standard deviation) when it applied for 25 d np 200 nm, his model can be used with d np ¼ 10 nm but with more than 1.85% error [39]. Nevertheless, although this incorporated small error, it is thought that Corcione model still offer more accurate results than the most common used Brinkman model.…”

Section: Mathematical Modelmentioning

confidence: 99%

Magnetic Field Effect on Mixed Convection in Lid-Driven Trapezoidal Cavities Filled With a Cu–Water Nanofluid With an Aiding or Opposing Side Wall

Chamkha

Ismael

2016

Journal of Thermal Science and Engineering Applications

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The present study investigates mixed convection inside a Cu–water nanofluid filled trapezoidal cavity under the effect of a constant magnetic field. The mixed convection is achieved by the action of lid-driving of the right hot inclined side wall in the aiding or the opposing direction. The left inclined side wall is fixed and kept isothermal at a cold temperature. The horizontal top and bottom walls are fixed and thermally insulated. The magnetic field is imposed horizontally. The problem is formulated using the stream function-vorticity procedure and solved numerically using an efficient upwind finite-difference method. The studied parameters are: the Richardson number Ri = (0.01–10), the Hartman number Ha = (0–100), the volume fraction of Cu nanoparticles φ = (0–0.05), and the inclination angle of side walls Φ = (66 deg, 70 deg, 80 deg). The results have shown that the suppression effect of the magnetic field for the aiding case is greater than that for the opposing case. Meanwhile, the enhancement of the Nusselt number due to the presence of the Cu nanoparticles is greater for opposing lid-driven case.

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Section: Mathematical Modelmentioning

confidence: 99%

Magnetic Field Effect on Mixed Convection in Lid-Driven Trapezoidal Cavities Filled With a Cu–Water Nanofluid With an Aiding or Opposing Side Wall

Chamkha

Ismael

2016

Journal of Thermal Science and Engineering Applications

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“…Diverse studies have found that as nanoparticles are reduced in size, the effective thermal conductivity of the nanofluid increases [13,64,[88][89][90][91][92][93][94]. As the nanoparticle size is reduced, Brownian motion is induced.…”

Section: Nanofiller Sizementioning

confidence: 99%

2D-Based Nanofluids: Materials Evaluation and Performance

Taha‐Tijerina¹,

Peña-Parás²,

Maldonado-Cortés³

2016

Two-Dimensional Materials - Synthesis, Characterization and Potential Applications

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Abstract"dvancement in technology demands the successful utilization of energy and its management in a greater extent. Thermal energy management plays a crucial role from high-payload electrical instruments to ultra-small electronic circuitries. The advent of nanofluids that happened in the s successfully addressed the low thermal efficiency of conventional fluids in a significant manner. The ground-breaking report on the concept of nanofluids for thermal management led to the development of numerous thermal fluids using nanofillers of ceramics, metals, semiconductors, various carbon nanostructures, and composite materials. Later, demonstration of two-dimensional D nanomaterials and their successful bulk synthesis led to the development of highly efficient fluids with even very low filler fractions. Introduction of D materials into fluids also brought out the multifunctional aspects of fluids by using them in tribology. In this chapter, we narrate the advances in thermal nanofluids and the development of novel fluids with the discovery graphene. Multifunctional aspects of these fluids are discussed here. To support the experimental observation, a theoretical platform is discussed and its predictions are correlated on the basis of existing data. The chapter has been concluded with a brief discussion on futuristic aspects of nanofluids in reallife applications. This chapter aims to focus on the description of the thermal transport, tribological behavior, and aspects that involve the use of D-based nanofluids, from various D nanostructures such as h-"N, MoS , WS , graphene, among others. The homogeneous nanoparticle distribution within conventional fluids and the results from the thermal transport and tribological tests and observations are included. The nanofluids under investigation belong mainly to dielectric and metal-mechanic lubricants. "lso, the mechanisms that promote these effects on the improvement of nanofluids properties are considered.

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“…They found that a brick shape achieved the minimum entropy generation in copper tubes. Arani et al [22] experimentally investigated the effect of TiO 2 nanoparticle diameter (10 nm, 20 nm, 30 nm, and 50 nm) on the pressure drop and thermal performance of nanofluid in a tube heat exchanger. The results showed that 20 nm nanoparticles had a higher thermal performance factor.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Effect of Nanoparticle Diameter and Sphericity on the Thermal Performance of Geothermal Heat Exchanger Using Nanofluid as Heat Transfer Fluid

Jiang

Wang

2020

Energies

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The geothermal heat exchanger system is one of the most energy-efficient and environmentally friendly building service systems. In the present study, CuO/water nanofluid was used as the heat transfer fluid to enhance the energy efficiency of the geothermal heat exchangers. A three-dimensional numerical model was employed to investigate the effect of nanoparticle diameter and sphericity on the thermal performance of the geothermal heat exchanger, and it was well validated against the experimental results of nanofluids in the geothermal heat exchangers. The numerical results showed that nanoparticles with a diameter of 5 nm and 50 nm were not recommended for the nanofluids used in the geothermal heat exchangers due to the performance efficiency coefficient lower than 1, and the optimum diameter was 40 nm, which had the highest performance efficiency coefficient (1.004875). Moreover, the spherical particle-based nanofluid was characterized by the 8.55% higher energy efficiency, in comparison to rod-shaped particle-based nanofluid. Therefore, the application of nanofluid in the geothermal heat exchanger can enhance heat transfer, and the proposed optimum particle diameter and sphericity could contribute to higher energy efficiency.

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Experimental investigation of diameter effect on heat transfer performance and pressure drop of TiO2–water nanofluid

Cited by 172 publications

References 46 publications

Magnetic Field Effect on Mixed Convection in Lid-Driven Trapezoidal Cavities Filled With a Cu–Water Nanofluid With an Aiding or Opposing Side Wall

Magnetic Field Effect on Mixed Convection in Lid-Driven Trapezoidal Cavities Filled With a Cu–Water Nanofluid With an Aiding or Opposing Side Wall

2D-Based Nanofluids: Materials Evaluation and Performance

Numerical Investigation of the Effect of Nanoparticle Diameter and Sphericity on the Thermal Performance of Geothermal Heat Exchanger Using Nanofluid as Heat Transfer Fluid

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