Darcy friction factor and Nusselt number in laminar tube flow of Carreau fluid

Kim, Sun Kyoung

doi:10.1007/s00397-021-01317-w

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…As a result, the overall variation alongside the shear rate becomes insignificant. Similar results can also be found in [10,12,22]. Figure 4 shows the evaluated Nu alongside 𝜑 for a given n. For a given n, the overall Nu curve comes down toward Nu as 𝜑 increases, as shown in the figure.…”

Section: Evaluation Of Nusselt Numbersupporting

confidence: 80%

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Correlations for Convective Laminar Heat Transfer of Carreau Fluid in Straight Tube Flow

Kim

2022

Energies

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Correlations for the Nusselt number for the fully-developed laminar flow of Carreau fluids through circular pipe subject to a uniform heat flux have been sought. Based on the mathematical expression, the Nusselt number could be obtained by numerical integration. To evaluate the Nusselt number for many conditions, an efficient integration method has been proposed. Using the obtained Nusselt number for different material constants and flow conditions, an improved correlation method has been proposed. The proposed correlation could reduce the maximum error from 3% to 0.9%.

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Section: Evaluation Of Nusselt Numbersupporting

confidence: 80%

“…r dr where the flow rate is given by Q = q c (R). Then, the Nusselt number is expressed as [22] Nu ≡…”

Section: Nusselt Numbermentioning

confidence: 99%

Correlations for Convective Laminar Heat Transfer of Carreau Fluid in Straight Tube Flow

Kim

2022

Energies

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“…Existing studies on hot runners have primarily focused on efficient melt delivery [9,10] and sequential gating [11,12]. Some investigations have also examined pressure drop, velocity, and heat transfer in the runner flow of melt [13][14][15]. This study aims to develop a suitable thermal and mechanical model for the hot runner system, considering its structural aspects.…”

Section: Hot Runner Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Deformation in Hot Runner Manifold

Jung

Kim

2023

Micromachines

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This study simulated the deformation of a hot runner manifold and nozzle assembly during operation, aiming to address potential leaks and premature failure. Both thermal and mechanical models were used simultaneously to accurately capture system behavior. A simplified set of boundary conditions was proposed for efficient problem-solving. Analysis of the simulation results revealed that thermal deformation posed a risk of catastrophic failures and leaks. Deformation from melt pressure was relatively small compared to thermal loading, not exceeding 12%. The study provided design recommendations based on the simulation findings, guiding the development of hot runner systems for improved reliability.

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