Thermo-hydraulic study in a shell and tube heat exchanger using rod inserts consisting of wire-nails with air injection: Experimental study

Marzouk, S.A.; Al-Sood, M.M. Abou; El-Fakharany, Magda K.; El‐Said, Emad M.S.

doi:10.1016/j.ijthermalsci.2020.106742

Cited by 29 publications

(5 citation statements)

References 17 publications

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“…Furthermore, authors are disregarded during their work analysis [25]. The dimensionless augmentation entropy generation number (N s,aug ) is the most frequently utilize criterion, while the EGM criterion has been used to model and optimize HEs design and can be calculated from Equation (14) [20,26].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, the Nu was enhanced by 452% for the case of ABI compared with the original case (without ABI). Marzouk et al [14] conducted their experimental study to study the effects of injected air bubbles on the thermo-hydraulic performance of a shell-and-tube-heat exchanger. In their study, the shell fluid volume flow rate was kept constant at 1080 L/h and the tube side volume ranged between 840 and 960 L/h.…”

Section: Introductionmentioning

confidence: 99%

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Combined Energetic and Exergetic Performance Analysis of Air Bubbles Injection into a Plate Heat Exchanger: An Experimental Study

Marouf

Fouad

2023

Energies

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This paper aims to give a comprehensive energetic-exergetic performance analysis on the impacts of injecting-submillimeter of air bubbles into both sides of cold and hot water streams before the entrance port of a corrugated plate heat exchanger (C-PHE) having ten plates within counterflow configuration. Hence, optimize the energy and exergy effectiveness at different operating conditions for counter and parallel fluid flow configurations. Hot streams were studied in seven flow rates ranging from 280 L/h to 880 L/h with a regular step of 100 L/h, and constant hot water temperature and cold-water stream of 50 °C and 290 L/h, respectively. Hence, the air was discharged with four flow rates ranging between 150 and 840 L/h. The obtained results showed the vital role of the ABI technique in enhancing the NTU and effectiveness by 59% and 18.6%, respectively, for CWS. The entropy generation was reduced to 0.038 W/K and the augmentation entropy generation number to 0.087 at the low airflow rate for CWS, which are the main parameters for evaluating the EGM. These two parameters increase the Witte-Shamsundar-efficiency to a maximum value of 98.6% at the same operating conditions. Moreover, the exergy effectiveness was enhanced to a maximum value of 80.9% at a high ABI flow rate and low volumetric rate of the hot stream at CWS. The thermo-economic assessment has been carried out, which revelers the positive effects of ABI on the combined energetic and exergetic performance on both sides, i.e., hot and cold sides.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combined Energetic and Exergetic Performance Analysis of Air Bubbles Injection into a Plate Heat Exchanger: An Experimental Study

Marouf

Fouad

2023

Energies

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“…The author noticed that the larger slant angle ( α = 20°) and smaller pitch (S = 30 mm) effectively enhance the flow resistance and HT rate. Marzouk et al 68 introduced tube inserts (two inserts with different distances of 10 and 5 cm) inside the tubes of shell and tube HE to enhance the HT performance by employing three different air volumetric flow rates (1, 2, and 3 LPM) and studied the thermal parameters and hydraulic performance. Rahimi et al 69 experimentally and numerically studied friction factor, Nusselt number, and thermal‐hydraulic performance of a tube with three (classic, perforated, notched, and aged twisted tape) different modified twisted tape inserts and compared them with classical insert, the author noticed that 31% improvement in Nusselt number and 22% improvement in aged insert were compared with the classic one.…”

Section: Data Reductionmentioning

confidence: 99%

Augmentation of heat transfer through passive techniques

Nitturi,

Kapu,

Gugulothu

et al. 2023

Heat Trans

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The thermal performance of energy preservation systems is greatly improved by increasing miniaturization and boosting. These are imaginative (or Promethean) techniques to enhance heat transfer. Enhancement methods of heat transfer draw great attention in front of the industrial sector because of their ability to provide energy savings and raise the economic efficiency of thermal systems. Three techniques these methods are categorized; those are active, passive, and compound. Different types of components are used in passive methods because of the transfer/working fluid flow path to the enhancement of the heat transfer rate. In this article, the subject of the review was the passive heat transfer enhancement methods including inserts (conical strips, winglets, twisted tapes, baffles), porous materials, coil/helical/spiral tubes, rough surfaces (corrugated/ribbed surfaces), extended surfaces (fins) and nanofluids (mono and hybrid nanofluid). Recent passive heat transfer enhancement techniques are studied in this article as they are cost‐effective and reliable, and also comparably passive methods do not need any extra power to promote the energy conversion systems' thermal efficiency than active methods. In the passive approaches, various components are applied to the heat transfer/working fluid flow path to improve the heat transfer rate. The passive heat transfer enhancement methods studied in this article include inserts (twisted tapes, conical strips, baffles, winglets), extended surfaces (fins), porous materials, coil/helical/spiral tubes, rough surfaces (corrugated/ribbed surfaces), and nanofluids (mono and hybrid nanofluid). From the pioneers' research work, it is clear that a lower twist ratio and lower pitch, lesser winglet angles can provide more heat transfer rate and a little bit more friction factor. In the case of nanofluids, a little bit of pumping power is enhanced. Finally, heat transfer enhancement is compared with the thermal performance factor, which is more than unity.

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“…The heat balance deviation necessity be below than 5% and that realized in totally investigational tests. The U can be performed from (Marzouk et al, 2021) :…”

Section: Dimension Redactionmentioning

confidence: 99%

Thermal performance improvement of shell and helical coil heat exchanger

ABED¹,

Koç²

2021

AURUM Journal of Engineering Systems and Architecture

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Nowadays, energy consumption increases so it is necessary to enhance the efficiency and performance of heat energy transition. The effects of perforated twisted tape on heat transfer coefficient, effectiveness, Nusselt number, and pressure drop are studied numerically. Modeling of heat exchanger with the perforated twisted tape is applied where finite volume method is utilized to perform the setup and complete the solution.The numerical results are validated with previous experimental results and there is an excessive agreement between the numerical and experimental results. The range of Reynolds numbers is from 3800 to 18000. The results showed that the overall heat transfer coefficient U increases with the rise of Reynolds number where the perforated twisted tape achieves the maximum enhancement of heat transfer coefficient achieving the numbers from 965 to 1250 W/m 2 K. The perforated twisted tape has the highest ratio of enhancing Nusselt number following the numbers from 65 to 115 and this can be explained as the velocity rises, the turbulence level increases. Heat exchanger effectiveness increases with the growth of Reynolds number where the perforated twisted tape attained the supreme enhancement of effectiveness reaching the numbers from 0.35 to 0.85. It is indicated that the twisted tape configuration has the maximum ratio of pressure drop increase as the complicity of twisted tape rise the pressure drop. Contours and streamlines of hot and cold water cross the heat exchanger explains the distributions of temperature, velocity, and pressure.

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Thermo-hydraulic study in a shell and tube heat exchanger using rod inserts consisting of wire-nails with air injection: Experimental study

Cited by 29 publications

References 17 publications

Combined Energetic and Exergetic Performance Analysis of Air Bubbles Injection into a Plate Heat Exchanger: An Experimental Study

Combined Energetic and Exergetic Performance Analysis of Air Bubbles Injection into a Plate Heat Exchanger: An Experimental Study

Augmentation of heat transfer through passive techniques

Thermal performance improvement of shell and helical coil heat exchanger

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