Investigation of the Effect of Flow Rate on Fluid Heat Transfer in Counter-Flow Helical Heat Exchanger Using CFD Method

Ghiasi, Pedram; Salehi, A.; Hoseini, S.S.; Najafi, Gholamhassan; Mamat, Rizalman; Balkhaya, Balkhaya; Khoerunnisa, Fitri

doi:10.37934/cfdl.12.3.98111

Cited by 7 publications

(5 citation statements)

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“…The corresponding values for heat flux were determined in Figure 5. A notable increase in values of hmax and qmax can be seen with increasing velocities [22].…”

Section: Effect Of Velocitymentioning

confidence: 80%

Determination of Limiting Heat Flux for The Inception of Nucleate Boiling Regime for Crude Oils

Rehman

Ramasamy

Rozali

et al. 2021

ARFMTS

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Finding the limiting heat flux above which nucleate boiling starts and below which forced convective heat transfer exists is a crucial task for the accuracy of results from crude oil fouling tests. In this study, crude oils from two sources were tested at bulk temperatures of 100, 120 and 140 °C and different velocities. Heat transfer coefficient increased gradually with bulk temperature indicated lowering of the viscosity at high temperatures which promoted turbulence and enhanced heat transfer. The velocity effects were similar to that of bulk temperatures on maximum heat transfer coefficient while less heat flux was required to achieve the same surface temperature at lower velocities. Deshannavar and Ramasamy’s model to predict maximum heat flux was compared with experimental results and a poor estimation was observed for the crude oils tested.

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“…The corresponding values for heat flux were determined in Figure 5. A notable increase in values of hmax and qmax can be seen with increasing velocities [22].…”

Section: Effect Of Velocitymentioning

confidence: 80%

Determination of Limiting Heat Flux for The Inception of Nucleate Boiling Regime for Crude Oils

Rehman

Ramasamy

Rozali

et al. 2021

ARFMTS

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show abstract

“…With correlation coefficients of 0.98 and 0.97 for hot and cold streams, respectively, the model explained the experimental results. Furthermore, the wire-insert in the cold flow channel increased fluid turbulence, and the temperature difference between the cold fluid inlet and outflow was proportional to the hot fluid temperature [18].…”

Section: Resultsmentioning

confidence: 99%

Computational Fluid Dynamics of Two-Phase Flow Pressure Gradient of Air-Sodium Chloride and Glucose in Horizontal Capillary Channels

Sukamta

Anwar

Sudarja

et al. 2022

CFDL

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One of the problems in the two-phase flow is investigating the type of flow pattern that occurs in a mini channel without experimenting first. Computational Fluid Dynamics (CFD) is one way that can be used to predict pressure drop, flow pattern, void fraction, other parameters in fluid flow through a channel of a specific size. This research used the CFD simulations to predict the pressure gradient in a two-phase flow of air-sodium chloride 0.9% and glucose in a horizontal capillary tube with a diameter of 1.6 mm, and length of 70 mm. This research aims to obtain the simulation results of 2D and 3D pressure gradients to validate the experimental data. The simulation was carried out with a variation of the superficial gas velocity 0.1 - 8.3 m / s against the superficial velocity of the liquid constant 0.207 m / s. Simulations were carried out using the Volume of Fluid (VOF) model with the "ANSYS Fluent 2020 R1" software. In 2D and 3D simulations, the gradient values of pressure gradients tend to increase as JG increases. The pressure gradient fluctuates linearly at first, then exponentially from mid-to-end. The findings demonstrate that simulations may properly model physical processes like pattern creation and phase interactions. However, due to several physical elements considered in 3D simulation but missed in 2D simulation, the findings of the 2D and 3D simulations were dramatically different when looking at the pressure gradient values.

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“…Finally, experimental result was validated by using statistical analysis. Based on uncertainty analysis, measured and predicted values were explained in details for the better understanding of the developed OHP [31][32][33][34][35].…”

Section: Resultsmentioning

confidence: 99%

Assessment and Prediction of Heat Transfer Performance of Oscillating Heat Pipe using Acetone

Prashanth¹,

Madhu²,

Ramanarasimha³

et al. 2022

ARFMTS

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Heat pipe is a device to enhance the performance of heat transfer, in particular to transition phase change process. The present investigation is carried out to measure the thermal performance of a closed loop acetone filled oscillating heat pipe with four turns is fabricated and tested. The test was carried out for the inner diameter of 1.7 mm copper tube by varying the acetone of 50%, 60%, 70% and 80% filler ratio with a heat input of 15 W to 40 W in steps of 5 W has been considered. The results shows that 80% acetone filled OHP provides the better thermal performance with an average minimum temperature difference between condenser and evaporator by 6.03%, heat transfer coefficient increased by 77% and the thermal resistance decrease by 43% respectively. The mathematical modelling was developed to predict the performance of the heat transfer. The model clearly shows that the independent variables are statistically significant with a p-value of 0.05 and the uncertainty analysis between the experimental and predicted values are less than 10%.

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Investigation of the Effect of Flow Rate on Fluid Heat Transfer in Counter-Flow Helical Heat Exchanger Using CFD Method

Cited by 7 publications

References 0 publications

Determination of Limiting Heat Flux for The Inception of Nucleate Boiling Regime for Crude Oils

Determination of Limiting Heat Flux for The Inception of Nucleate Boiling Regime for Crude Oils

Computational Fluid Dynamics of Two-Phase Flow Pressure Gradient of Air-Sodium Chloride and Glucose in Horizontal Capillary Channels

Assessment and Prediction of Heat Transfer Performance of Oscillating Heat Pipe using Acetone

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