CFD modeling of laminar flow and heat transfer utilizing Al2O3/water nanofluid in a finned-tube with twisted tape

Habeeb, Laith Jaafer; Saleh, Fouad A.; Maajel, Bassim M.

doi:10.5937/fmet1901089h

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…As a comparison, we also present formula (12) for calculating the turbulent viscosity of air flows [33,34,37]. From the formula (8) it is seen that the ratio of turbulent and molecular viscosity is the ratio .…”

Section: P Turb Turbmentioning

confidence: 99%

“…Also, nanofluids are widely used to increase the efficiency of heat exchange apparatuses as additives to heat carriers [6,7]. Some scientific works are devoted to mating combinations of various methods of enhancing heat transfer in heat exchangers, for example, using nanofluids simultaneously with spiral twists [8,9], using nanopowders with ethylene or propylene glycol additives to water [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Universal Numerical Equation and a New Method for Calculating Heat-Exchange Equipment Using Nanofluids

Bіlonoga¹,

Stybel²,

Maksysko³

et al. 2020

IJHT

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This article analyzes the vast material of works devoted to the use of nanofluids in heat exchange equipment. It is proved that the use of the classical theories and equations for calculating the viscosities and thermal conductivities of nanofluids is not correct, since it does not coincide with the experimental results of most independent authors. A model of the chaotic motion of a nanoparticle is presented taking into account surface tension forces in a liquid coolant. The experimental results of the work of Malaysian and Iran authors on the effect of TiO2 nanoparticles with a concentration of 0.5%; 1.0% and 1.5% in the main liquid solution of ethylene glycol (EG) in water in a volume ratio of 40:60% in terms of heat transfer coefficient are compared with our theoretical studies. The results of the experiments presented in: an increase in heat transfer coefficients by 9.72%, 22.75%, 28.92% for 1.5% volume concentration of TiO2 nanoparticles at a coolant temperature of 30℃, 50℃, 70℃, respectively. Our theoretical result: increase in the obtained heat transfer coefficients by 9.79%, 22.22%, 29.09% according to our formulas (9, 10, 15) for calculating turbulent viscosities and thermal conductivities, which takes into account the effect of surface tension forces on the total flow of nanofluids in the channels of heat exchange equipment. A new method for calculating heat exchange equipment using nanofluids is presented, taking into account the action of surface tension forces, as well as predetermining the calculation of turbulent viscosities and thermal conductivity of nanofluids. A theoretical calculations a plate heat exchangers for a technological task performed by classical and new method is presented. Similar results were obtained, which differ by about 0.5 of a percent. The plate heat exchanger was calculated using a new method using TiO2 nanoparticles in water and in a mixture of EG in water in a ratio of 40:60%, as well as when pumpkin vegetable oil was added to milk with the optimal concentration.

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Section: P Turb Turbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Universal Numerical Equation and a New Method for Calculating Heat-Exchange Equipment Using Nanofluids

Bіlonoga¹,

Stybel²,

Maksysko³

et al. 2020

IJHT

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show abstract

“…Many researches have proven an improvement in performance with the usage of various nano fluids [2][3][4]. The most explored nanomaterial is Al 2 O 3 nanoparticles and Al 2 O 3 -water based nanofluid is commonly used for enhancement in heat transfer [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Influence of Al2O3 nanoparticles on thermal performance of closed loop pulsating heat pipe

Babu¹,

Reddy²,

Reddappa³

et al. 2020

FME Transactions

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With the rapid development of electronic technology, many new promising ideas and technologies were introduced into thermal management, one of which is pulsating heat pipe (PHP), which is different from traditional heat transfer strategy. Hence, an investigation on pulsating heat pipe with multi turns will be conducted in order to examine nanoparticles effect on heat transport ability. The pulsating heat pipe consists of copper tube having inside radius of 1 mm, thickness of 0.5 mm and total length of 1605 mm. The investigation is done with acetone with a filling proportion of 60% for different % mass concentration of 1%, 2%, 3%, 4% and 5% of Al 2 O 3 nanoparticles for differed heat contribution from 20 W to 60 W. From the results of different % mass concentration, the most reduced value of thermal resistance is 0.28 K/W at 1% mass concentration. Hence the PHP operates better with 1% mass concentration of Al 2 O 3 nanoparticles.

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“…The passive technique is applied for producing the swirl flow and in turn disturbing the regions rich of the boundary layer close to the HT surface. [2] The passive technique can be achieved via installing the swirl turbulators/generators within the heating system. Several researchers have studied the effect of different geometries on HT rate for several twisted tapes and how that enhance HT efficiency and affect the pressure drop.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement by Turbulence Generator inside Heat Receiver

zaid

Hamzah

2020

QJES

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Tubular heat exchanger (THEX), that has been in numerous engineering applications, represents an apparatus that makes heat to be exchanged between two fluids having different changing in temperatures and kept separated by means of a solid wall. In order to enhance the efficiency of the THEX, the rate of heat transfer at the tube side should be improved. Inserting a twisted tape inside the heat exchanger’s tube is one of the passive techniques that has been widely used to improve the heat transfer especially in air conditioning and cooling, processes of power recovery, processes for food and dairy, and plants for chemical processing. The heat exchanger enhancement is achieved by means of using a twisted tape inserted with twisting ratios (TR) equal to 3.2, 4.4, and 5.5, independently. The influences of 2-D parameters such as Nusselt number and frictional coefficient on the THEX’s effectiveness were investigated. The aim of the study is inserting a twisted tape inside the testing pipe to produced turbulent flow and, therefore, creating large turbulence rate inside the pipe that plays an significant role in improving the transferred heat and increasing the drop in the pressure. In this work, the inserted tape has a width and length equal to 21.5 mm and 1000 mm, respectively. The inner and outer diameters of the used pipes were 23 mm and 22 mm, respectively. The tested sectional length of the THEX was equal to 2000 mm. Reynolds number was changed from 500 to 7000. Results obtained from using twisted inserting tapes with varying TR were compared with result from plain tubes. These results were displayed in the contours show the distribution of the temperature and the trajectory of the flow trajectory by axial velocity for testing the low values of Reynolds number applicability in heat exchanger applications

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CFD modeling of laminar flow and heat transfer utilizing Al2O3/water nanofluid in a finned-tube with twisted tape

Cited by 10 publications

References 14 publications

A New Universal Numerical Equation and a New Method for Calculating Heat-Exchange Equipment Using Nanofluids

A New Universal Numerical Equation and a New Method for Calculating Heat-Exchange Equipment Using Nanofluids

Influence of Al2O3 nanoparticles on thermal performance of closed loop pulsating heat pipe

Heat Transfer Enhancement by Turbulence Generator inside Heat Receiver

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