Numerical analysis of water, ethylene glycol and nanofluid based radiator using CFD

Bejjam, Ramesh Babu; Nigusie, Kindye; Wondatir, Tesfay; Worku, Solomon

doi:10.1016/j.matpr.2021.04.503

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…Nevertheless, we confirmed that this velocity condition complies with the indoor air-velocity range regarding thermal comfort (0.25-0.5 m/s). 53 This result is in parallel with the work of Bayatian et al 54 Their contaminant removal experiment through vertical laminar flow in a 3.95 × 2.35 × 2.65 m (W x D x H) wardroom, found that contaminants are reduced most effectively when the outdoor air of ∼0.3 m/s is supplied to the space.…”

Section: Resultssupporting

confidence: 82%

A vertical laminar airflow system to prevent aerosol transmission of SARS-CoV-2 in building space: Computational fluid dynamics (CFD) and experimental approach

Jeong

Park

et al. 2022

Indoor and Built Environment

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Respiratory aerosol particles carrying the severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) are a primary cause of the long-distance infection, and insufficient ventilation systems make building occupants highly prone to the coronavirus disease-2019 (COVID-19). As a preventive measure of the aerosolized viable SARS-CoV-2 suspension in building space, we seek to propose an optimal design of the upper-room/drop-ceiling aeration grid system generating vertical laminar airflow (VLAF) as an aerosol barrier. On a test plan (6.1 × 4.7 m) representing the standard hospital patient room in South Korea (a 2.7 m-height room of 77.4 m3 in volume), we investigated the air-terminal size, spacing and air speed that shape uniform downflow of fresh air, minimizing horizontal spread. Our simulation results using the Taguchi method and computational fluid dynamics (CFD) in presence of indoor human expiration indicated that a steady vertical air supply of 0.3 m/s through 0.04m-diameter air diffusers deployed by 0.5 m spacing is the most effective to form VLAF. Physical particle detection tests at the height of 1.5 m in mockup setting of the optimal system design, revealed that expiratory aerosols produced by a single person were almost entirely removable in 20 s. Investigations also confirmed that the proposed design could minimize stagnant airflow regions and would potentially satisfy the indoor air-speed condition for occupant thermal comfort.

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Section: Resultssupporting

confidence: 82%

A vertical laminar airflow system to prevent aerosol transmission of SARS-CoV-2 in building space: Computational fluid dynamics (CFD) and experimental approach

Jeong

Park

et al. 2022

Indoor and Built Environment

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“…Delavari et al 15 performed CFD analysis on a car radiator using nanofluids (Al 2 O 3 water and Al 2 O 3 ethylene glycol) and reported the variation of local heat transfer coefficient and friction factor along the length of the fin, variation of nanoparticle concentration on Nusselt number, variation of nanoparticle concentration on friction factor and variation of inlet temperature on Nusselt number. Bejjam et al 16 numerically investigated the effect of water, ethylene glycol, and nanofluid on a car radiator and reported Nusselt number increased with increased volume concentration and volume flow rate and concluded that nanofluid‐based radiators performed better compared to the conventional coolant‐based radiator. Das et al 17 experimentally studied the functioning of graphene‐based nanofluid in thermosyphon at different inlet temperatures and at different inclinations and found that the graphene‐based nanofluid has a higher thermal conductivity than normal water by 29% at 218 K. Bharadwaj et al 18 performed computational fluid dynamic analysis on car radiator using graphene‐based nanofluids and found that heat transfer of automobile radiator increased when nanofluid was used because of the greater surface area of the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of a flat tube with semi‐circular fins using graphene nanofluid and to compare performance with square type of fins

2022

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CFD analysis on a flat tube with semi‐circular fins under laminar flow conditions was performed with graphene‐based nanofluids considering the nanofluids as incompressible. Different simulations were performed at four different concentrations of nanofluids (0.01%, 0.1%, 0.2%, and 0.4%) and at different volume flow rates (4, 6, 8, and 10 LPM) and at four different forced convective heat transfer coefficients at different wind velocities at 300 K (50, 100, 150, and 200 W/m2 K). It was observed that with an increase in the concentration of nanoparticles in nanofluids, the thermal conductivity of base fluid water was increased (at 353 K the nanofluid of 0.4% volume concentration, the thermal conductivity of nanofluid increased by 200% with respect to base fluid). Graphene‐based nanofluids have higher effectiveness than most nanofluids hence it is considered for the analysis, at 0.4% concentration of nanofluid the effectiveness observed was 36.84% at 4 LPM, and for water, the effectiveness was 28.22% under similar conditions. The effect of flow rate on temperature drop was significant. At 4 LPM and at 0.4% of nanofluid, an outlet coolant temperature of 333 K was observed whereas the water outlet temperature at 10 LPM is 346.13 K. The effect of forced convective air heat transfer coefficient was significantly high. At h = 50 W/m2 K the outlet temperature of 0.4% nanofluid at 4 LPM was 345.25 K and at h = 200 W/m2 K, the outlet coolant temperature was 333.47 K. A single tube of the radiator was considered for the analysis whereas the original radiator consists of 50 tubes due to problems of Ansys in meshing.

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Comparison of experimental results with numerical simulation of thermal performance in car radiator using MWCNT/EG/water nanofluid

do Nascimento,

Cardenas Contreras,

Cabezas-Gómez

et al. 2024

J Braz. Soc. Mech. Sci. Eng.

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Numerical analysis of water, ethylene glycol and nanofluid based radiator using CFD

Cited by 6 publications

References 6 publications

A vertical laminar airflow system to prevent aerosol transmission of SARS-CoV-2 in building space: Computational fluid dynamics (CFD) and experimental approach

A vertical laminar airflow system to prevent aerosol transmission of SARS-CoV-2 in building space: Computational fluid dynamics (CFD) and experimental approach

CFD analysis of a flat tube with semi‐circular fins using graphene nanofluid and to compare performance with square type of fins

Comparison of experimental results with numerical simulation of thermal performance in car radiator using MWCNT/EG/water nanofluid

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