Numerical Study of Heat Transfer Enhancement for Mono and Hybrid Nanofluids Flow in a Straight Pipe

Azman, Azraf; Yusoff, Mohd Zamri; Mukhtar, Azfarizal; Gunnasegaran, Prem; Hamid, Nasri A.; Ng, Khai Ching

doi:10.37934/cfdl.13.2.4961

Cited by 19 publications

(12 citation statements)

References 23 publications

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“…This reason supports the KHz range frequencies for underwater wireless power transfer [18]. However, high frequencies can further be investigated for near field applications (<10 m) in order to estimate the guided wave and their applications [19,20].…”

Section: Acoustic Pressure Fieldmentioning

confidence: 52%

Impact of THz Frequency on Underwater Acoustic Wave Propagation for Short Range Wireless Applications

Awal

Yahya

Afrizal

et al. 2021

CFDL

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Acoustic propagation in seawater is an important aspect of scientific investigation. However, the impact of the THz scale frequencies for acoustic propagation is not included in the studies. Thus, a finite element analysis of such propagation in a seawater medium is presented in this paper applying THz frequencies. A transmitter (circular with a diameter of 14 mm, a thickness of 3 mm) and a rectangular receiver (20×10×0.5 mm3) are designed to trace the variations in the propagation mediums. A propagation medium of seawater (70×40×60 mm3) with ice and softwood is modelled. A scale of frequencies (1 kHz to 1 THz) is applied to trace the impact on the propagation pattern. It is found that THz range frequencies provide a very small wavelength. As a result, the potential propagation distance is very small. As such, the sound pressure level, displacements of the receiver and pressure field shows very rapid drops in the magnitude. This work considers only 70 mm as propagation distance, yet the sharp decrement of performance parameters suggests that it is rather inconvenient to achieve useful efficiency using THz frequencies for acoustic propagation.

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Section: Acoustic Pressure Fieldmentioning

confidence: 52%

Impact of THz Frequency on Underwater Acoustic Wave Propagation for Short Range Wireless Applications

Awal

Yahya

Afrizal

et al. 2021

CFDL

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“…This model assumed laminar flow model and the porous media is homogenous in the flow domain. For pressure velocity coupling, SIMPLE algorithm was applied [27]. Using second-order upwind systems, the convection terms in the conservation equations were discretized [28].…”

Section: Flow Domain and Boundary Conditionsmentioning

confidence: 99%

CFD Simulation of CO2 and Methane Adsorption at Various Temperature for MOF-5 using Dual-site and Single-site Langmuir Model

Zulkifli

Mukhtar

Fadli

et al. 2021

CFDL

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The annual increase in energy demand has led to an increase in greenhouse gas emissions, in particular CO2 emissions from the power generation industry. Carbon Capture and Utilization are technologies applied to capture CO2 gases and transform the gases into a different energy source. The adsorption technology to capture CO2 gases was chosen due to the minimum energy consumption and low costs required for an industrial application for sustainability. Metal-Organic Framework (MOF) has a reasonably high CO2 adsorption capability. It has been applied as an adsorbent for capturing and storing CO2. In this study, a comparison of CFD simulation with experimental CO2 and methane adsorption values in solid adsorbent beds containing MOF-5 at various temperatures was presented. The simulation was performed using 2D and 3D models from 0℃ at STP to 130℃ for CO2 and methane gas molecules. In addition, the isothermal and kinetic adsorption model was added to the simulations. This includes Single- and Dual-Site Langmuir adsorption isotherm and Linear Driving Force. The porous media model was then activated to imitate packed bed adsorbent and measured the pressure drop from the simulation. The results showed that the CO2 adsorption values of MOF-5 decrease as the adsorbent temperature increases. There was a decline of 0.002 mmol/g of adsorbed CO2 molecules per 10-kelvin difference. The CO2 adsorption value was 0.53 mmol/g at STP and 1.15 mmol/g for CH4 at STP. Both CO2 and CH4 adsorption were used to suggest optimal CO2 adsorption for the Pressure Swing Adsorption cycle.

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“…Recently, the use of nanofluids as coolant has become a new research focus and it has been identified as an ideal candidate for enhancing heat transfer [5,6]. The nanofluid is created from the dispersion of nanomaterials (e.g., nanoparticles, nanofibers, nanotubes, nanowires, nanorods or nanosheets) in base fluids, such as water and oils [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Quarry Dust and Aluminium Oxide Suspension as Cutting Fluid for Drilling of Titanium Alloy

Othman

Liew

Chang

et al. 2022

ARFMTS

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In the aerospace field, titanium alloys are extensively used for the airframe and engine parts to improve aircraft fuel consumption. Drilling through these parts in a single-shot process to produce high quality holes is challenging. During drilling, high temperatures are generated owing to the friction between the cutting tool and workpiece, causing the process becomes inefficient in terms of tool life and surface quality. To reduce the temperature produced in the cutting zone, different types of cooling techniques during drilling have been used by researchers. In this study, the feasibility of quarry dust suspension as coolant in drilling of titanium alloy was performed. The effects of different concentrations of quarry dust on surface roughness, thrust force, and burr formation were evaluated, and their machining performances were compared with those obtained using aluminium oxide suspension. Before the experiments, both suspensions were prepared by dispersing quarry dust and aluminium oxide particles into deionised water at various concentrations ranging from 0 wt% to 0.10 wt%. Results indicated that by using 0.06 wt% of quarry dust suspension, thrust force and surface roughness showed an improvement by 8.31% and 18.29%, respectively, compared with those of aluminium oxide suspension at the same concentration. The burr height formed at the drilled holes using 0.06 wt% of quarry dust was also lower than that formed with aluminium oxide suspension at the same concentration.

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Numerical Study of Heat Transfer Enhancement for Mono and Hybrid Nanofluids Flow in a Straight Pipe

Cited by 19 publications

References 23 publications

Impact of THz Frequency on Underwater Acoustic Wave Propagation for Short Range Wireless Applications

Impact of THz Frequency on Underwater Acoustic Wave Propagation for Short Range Wireless Applications

CFD Simulation of CO2 and Methane Adsorption at Various Temperature for MOF-5 using Dual-site and Single-site Langmuir Model

Experimental Study of Quarry Dust and Aluminium Oxide Suspension as Cutting Fluid for Drilling of Titanium Alloy

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