Performance evaluation and exergy analysis of a double pipe heat exchanger under air bubble injection

Heyhat, Mohammad Mahdi; Abdi, Adel; Jafarzad, Ali

doi:10.1016/j.applthermaleng.2018.07.129

Cited by 48 publications

(11 citation statements)

References 19 publications

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“…We suppose there is no work done or heat escapes the heat exchanger. The heat 𝑄 ̇ℎ of the hot water equals 𝑄 ̇𝑐 received by the cold water, i.e., 𝑄 ̇= 𝑄 ̇ℎ = 𝑄 ̇𝑐 , which is [20] 𝑄 ̇= 𝑚̇ℎ𝐶 𝑝 (𝑇 ℎ,in − 𝑇 ℎ,out ).…”

Section: 𝑅𝑒 = 𝐺 𝑐 𝐷 𝑒 𝜇 𝑤 mentioning

confidence: 99%

“…where, A is the total heat transfer area [20]. The effectiveness (ε) of heat exchanger is the ratio of actual (Qact) to maximum (Qmax) heat transfer rate, or 𝜀 = 𝑄 ̇𝑎𝑐𝑡 /𝑄 ̇max .…”

Section: 𝑅𝑒 = 𝐺 𝑐 𝐷 𝑒 𝜇 𝑤 mentioning

confidence: 99%

“…Multiple types of injectors were used by Heyhat et al [20] to blow air into the annulus side of heat exchanger. Experimental data were collected for different annulus side and inner tube flow rates.…”

Section: Introductionmentioning

confidence: 99%

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A Computational Study of Perforated Helical Tube Inserted in a Double Pipe Heat Exchanger with Fluid Injection

Abdulrasool¹,

Aljibory²,

Abbas³

et al. 2023

IJHT

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Heat exchangers are still in high demand for the majority of industrial applications. A double pipe heat exchanger, also known as a DPHE, is a device that is used to transfer heat from hot to cold liquids, primarily water. It is therefore of great importance to discover new methods improving their thermal-hydraulic performance. In the current computational study, the focus will be on a helical turbulator constructed with small perforations and built inside the annulus of DPHE. First, our results are validated against their counterparts of an experiment conducted by others to examine the flow under the effect of a helical solid wire and/or global air blown inside the annulus. Second, four cases are introduced to the flow inside the helical tube only, two different mass flow rates for single and two phase flows. All findings suggest that the optimal performance comes from pumping some quantity of the working fluid inside the helical tube with roughly 600% and 45% increase in terms of overall heat transfer coefficient and thermal effectiveness, respectively, compared to that of non-perforated turbulator. Furthermore, for this proposed device, single-phase flow with or without oscillations outperforms two-phase and/or steady flow.

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Section: 𝑅𝑒 = 𝐺 𝑐 𝐷 𝑒 𝜇 𝑤 mentioning

confidence: 99%

Section: 𝑅𝑒 = 𝐺 𝑐 𝐷 𝑒 𝜇 𝑤 mentioning

confidence: 99%

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A Computational Study of Perforated Helical Tube Inserted in a Double Pipe Heat Exchanger with Fluid Injection

Abdulrasool¹,

Aljibory²,

Abbas³

et al. 2023

IJHT

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“…Mohamad Omidi et. Al [6] (2017) analyzed the improvement procedure of twofold line heat exchanger [7][8][9][10][11][12][13][14][15][16][17][18][19][20] and intensity switch upgrade strategies have likewise been generally examined. Additionally, various exploration with respect to the use of nano fluids in twofold line heat exchanger have been referenced in component.…”

Section: International Journal Of Innovative Research In Engineering ...mentioning

confidence: 99%

Fluid Flow Analysis of Concentric Heat Exchanger With Different Nano Fluids and Mass Flow Rates

Kondaiah¹,

Babu²,

Venkateswarlu³

2022

IJIREM

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In this article, the overall performance of water and other nano fluids mixed with base fluid water in a twin pipe warmth exchanger is investigated. At quantity fractions of 0.35 percentage, the nano fluids are Silicon Oxide and silver nano fluid. The traits of nano fluids are decided the usage of theoretical calculations, which can be then utilised as inputs for analysis. CATIA parametric software program is used to create a 3D model of the dual pipe heat exchanger (plain and coil insert tube). CFD research of a dual pipe warmth exchanger with water, silicon oxide, and silver nano particle at diverse mass float fees of zero.32, zero. Fifty two, 0.72,zero.Ninety two, and 1.12 kg/sec is performed. Theoretical calculations on the twin pipe warmness exchanger had been additionally finished.

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“…A rise of 25-40 per cent in the (HTC) was found with same condition. Heyhat et al (2018) experimentally studied the effect of the injection of air bubbles as an active thermal efficiency (DPHE) process. Air bubbles are pumped into the annulus side by means of a number of injectors.…”

Section: Introductionmentioning

confidence: 99%

EXPERIMENTAL STUDY OF HEAT TRANFER AUGMENTATION USING AIR BUBBLE INJECTION AND (Al2O3 /WATER) NANOFLUID FLOW IN DOUBLE PIPE HEAT EXCHANGERS

Alkhafaji

Hamzah

Dr³

2021

IQJMME

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In the present work, an experimental study on how to increase the heat transfer coefficient (HTC) in double pipe heat exchanger (DPHE) use of a variety of Al2O3 Nano-dispersion concentrations mixed in water as base fluid with air bubble injection for counter flow arrangement under turbulent flow conditions with (Re) Reynold number range from (6000 t0 45000) . The thermal performance of (DPHE) has been enhanced with the use of two techniques. The first, is represented by adding nanoparticles to hot water (inner pipe) raising the (HTC) inside the inner tube. Increase the volume concentration cause increase in the viscosity of the nanofluid leading to increase in friction factor .Secondly is represented by Air bubble injection in outer pipe with cold water to enhance the (HTC). The mobility of air bubbles inside the water from down to up by the force of the buoyancy, and the movement of these air bubbles results in significant mixture and turbulence within the water. The variations of number of thermal units (NTU), exergy loss, dimensionless exergy and (Nu) are evaluated. The investigated parameters were cold water volume flow rates (8, 10, 12 and14) l/min, flow in outer tube. Also, three different volume flow rates of air (12, 16 and 20) l/min mixed with water in outer tube. The volume flow rates of hot water remains constant at (8 l/min) flow in inner pipe with three volumetric concentrations of given nanofluid. The results showed that the air bubble injection throughout the tube gave maximum enhancement in heat transfer characteristics followed by the no air bubble injection. Since the enhancement in heat transfer characteristics varies linearly with the volumetric concentration of Nanofluids, Nanofluids with 0.3% of Al2O3 nanoparticles gave more enhancements in (HTC) than the case without nanofluid. The Nusselt number increased about (8% - 45%).

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Performance evaluation and exergy analysis of a double pipe heat exchanger under air bubble injection

Cited by 48 publications

References 19 publications

A Computational Study of Perforated Helical Tube Inserted in a Double Pipe Heat Exchanger with Fluid Injection

A Computational Study of Perforated Helical Tube Inserted in a Double Pipe Heat Exchanger with Fluid Injection

Fluid Flow Analysis of Concentric Heat Exchanger With Different Nano Fluids and Mass Flow Rates

EXPERIMENTAL STUDY OF HEAT TRANFER AUGMENTATION USING AIR BUBBLE INJECTION AND (Al2O3 /WATER) NANOFLUID FLOW IN DOUBLE PIPE HEAT EXCHANGERS

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