Analysis of tube-in-tube copper helical heat exchanger to improve heat transfer

Reddy, N. Sreenivasalu; Subramanya, S. Gowreesh; Vishwanath, K. C.; Kanchiraya, S.; Satheesha, V.; Karthikeyan, M.

doi:10.1016/j.matpr.2020.11.043

Cited by 16 publications

(3 citation statements)

References 23 publications

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“… Validation of the current model with (a, b) existing numerical literature of Zhang et al [ 21 ] and (c) Experimental correlation of Manpalaz and Churchill [ 59 ]. …”

Section: Numerical Methodologymentioning

confidence: 96%

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Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

Fahad,

Hasan,

Ifraj

et al. 2024

Heliyon

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“… Validation of the current model with (a, b) existing numerical literature of Zhang et al [ 21 ] and (c) Experimental correlation of Manpalaz and Churchill [ 59 ]. …”

Section: Numerical Methodologymentioning

confidence: 96%

“…Marzouk et al [ 20 ] developed six distinct arrangements of multi-HTHE with different surface areas. Reddy et al [ 21 ] included a copper tube in a HTHE setup. By implementing this modification, they achieved as much as 17.05 % augmentation for Nu and found a 15 % improvement in the f .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

Fahad,

Hasan,

Ifraj

et al. 2024

Heliyon

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“…dependendo das condições de contorno e hipóteses assumidas. O método de diferenças finitas, de elementos finitos e de volumes finitos são procedimentos numéricos utilizados para obter soluções aproximadas das equações diferenciais parciais que regem os fenômenos estudados, como escoamento e transferência de calor(MAZUMDER, 2016).Durante os últimos anos a modelagem e a simulação de processos têm sido um tema recorrente devido às vantagens já mencionadas, com destaque, nesta tese, para a área de processamento de alimentos(ABUSHAMMALA et al, 2020;GUT, 2018;DEPONTE et al, 2020;SIGUEMOTO et al, 2018a) e de escoamento e troca térmica de líquidos em tubos helicoidais(BORSE;BUTE, 2018;DEWANGAN;KUMAR, 2020;REDDY et al, 2021; ZHANG et al, 2021).Jayakumar et al (2008) estudaram a transferência de calor em um trocador de calor helicoidal com escoamento de água. Ensaios experimentais de troca térmica foram realizados e um modelo foi desenvolvido utilizando um código comercial de CFD.…”

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Desenvolvimento de um modelo semiempírico bidimensional para representar o fenômeno tridimensional de escoamento laminar e transferência de calor em um tubo helicoidal.

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The high mixing rate in laminar flow in helical pipes is an important characteristic in heating or cooling processes of fluids. In this work, a two-dimensional (2D) semiempirical model based on a straight tube was proposed to represent laminar flow and heat transfer in a helical tube and a three-dimensional (3D) model was developed to study the phenomenon of secondary flow and heat exchange enhancement. To adjust the 2D model, isothermal residence time distribution (RTD) experiments were carried out in a helical tube with flow of a glycerin/water mixture and a carboxymethyl cellulose (CMC) solution at flow rates from 0.5 to 2.0 L/min. RTD models were fitted to the experimental data.Heating and cooling experiments were conducted in the helical tube with flow of both fluids under different flow and temperature conditions, immersed in an ultrathermostatic water bath. Appropriate boundary conditions were applied to the models and mesh independency studies provided the mesh for the computational domain discretization of each model. Simulations were performed using the finite difference method for the 2D model and the finite element method for the 3D model under the experimental heating and cooling conditions. The velocity profile corresponding to the 𝑦-laminar RTD model (best fit) was included in the 2D model, and the outlet temperatures from the heating and cooling experiments were specified in the 2D model simulations to determine the heat transfer enhancement factor (𝐹). This factor was correlated with the Reynolds number and had a limit value of 𝐹 = 1 when there was no enhancement of heat transfer. The 3D model simulations for a cooling case with the CMC solution allowed the identification of Dean vortices in the flow, which were more evident at the higher flow rate (1.5 L/min).The 2D model simulations were completed in about 1 minute and had low consumption of RAM memory (1 GB), while the 3D model took up to 4 days to complete simulations with high consumption of RAM (250 GB). The fast simulations and the good temperature prediction of the 2D model can be used for predictive control in thermal processes, especially when it is necessary to have the temperature profile along the tube and not just the outlet temperature; however, since it is a semi-empirical model, it requires adjustments based on experimental data.

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Investigation of heat transfer and fluid flow in annular curved tubes in laminar flow using Al2O3–water nanofluid

Abdelmagied

2024

Discov Appl Sci

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Analysis of tube-in-tube copper helical heat exchanger to improve heat transfer

Cited by 16 publications

References 23 publications

Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

Desenvolvimento de um modelo semiempírico bidimensional para representar o fenômeno tridimensional de escoamento laminar e transferência de calor em um tubo helicoidal.

Investigation of heat transfer and fluid flow in annular curved tubes in laminar flow using Al2O3–water nanofluid

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