Enhanced Heat Transfer by Oil/Multi-Walled Carbon Nano-Tubes Nanofluid

Boursas, Abdelhakim; Salmi, Mohamed; Lorenzini, Giulio; Ahmad, Harith; Menni, Younes; Fridja, Djamal

doi:10.18280/acsm.450201

Cited by 6 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Others models, such as Tiwari et al, [18], Yousef and Hassan [19], Shukla and Modi [20], and Dwivedi and Tiwari [21] have lately been used in the presence of different experimental circumstances. Moreover, there are several studies that considered the heat transfer, solar energy, energy storage, etc, in channels and enclosures, and the following are just a few examples; Hassan et al, [22], Johnson et al, [23], Alawi and Kamar [24], Abdullah et al, [25], Lubis [26], Ghalambaz et al, [27,28], Hajjar et al, [29], Menni et al, [30][31][32][33][34][35][36][37][38]40], Menni and Azzi [39], Sakhri et al, [41,42], Bendjamaa et al, [43], Boursas et al, [44], etc.…”

Section: Tablementioning

confidence: 99%

Numerical Study of a Basin Type Solar Still with a Double Glass Cover Under Winter Conditions

Nahoui¹,

Rebhi

Lorenzini

et al. 2021

ARFMTS

View full text Add to dashboard Cite

A numerical analysis of a basin-type solar still with a double glass cover is done under winter circumstances of solar radiation, ambient temperature, and wind speed. Equations defining thermal balances of different components of traditional and double glass cover solar stills are used to describe the physical issue, which is then solved using the Gauss-Seidel numerical technique. The effects of solar radiation, ambient temperature, and wind speed on the daily production, internal efficiency, and overall performance of solar stills are calculated and illustrated. The findings demonstrate that a solar still with a double-glass cover is more productive and efficient than a solar still with a single glass cover.

show abstract

Section: Tablementioning

confidence: 99%

Numerical Study of a Basin Type Solar Still with a Double Glass Cover Under Winter Conditions

Nahoui¹,

Rebhi

Lorenzini

et al. 2021

ARFMTS

View full text Add to dashboard Cite

show abstract

“…They reported that the optimized oval-tube outperforms the conventional circular-tube shape by approximately 13% and 15% in heat transfer rates, 9% and 13.5% in coefficients of performance (COP), and 13% and 16.6% in heat transfer coefficients for Re = 1030 and 2060, respectively. Moreover, other investigations by numerical and experimental treatments have been carried out by Sakhri et al [42][43][44], Chamkha et al [45], Boursas et al [46], Chekchek et al [47], Hadidi et al [48], Menni et al [49][50][51][52], Ahmad et al [53], Salmi et al [54], Ameur et al [55], Mahammedi et al [56], Maouedj et al [57], etc. Their studies suggested different models of heat exchangers in order to improve the performance under various limit conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes

et al. 2021

Self Cite

View full text Add to dashboard Cite

In this study, eight configurations of oval and flat tubes in annular finned-tube thermal devices are examined and compared with the conventional circular tube. The objective is to assess the effect of tube flatness and axis ratio of the oval tube on thermal-flow characteristics of a three-row staggered bank for Re (2600 ≤ Re ≤ 10,200). It has been observed that the thermal exchange rate and Colburn factor increase according to the axis ratio and the flatness, where O1 and F1 provide the highest values. O1 produces the lowest friction factor values of all the oval tubes at all Re, and F4 gives 13.2–18.5% less friction than the other tube forms. In terms of performance evaluation criterion, all of the tested tubes outperformed the conventional circular tube (O5), with O1 and F1 obtaining the highest values. The global performance criterion of O1 has been found to be 9.6–45.9% higher as compared to the other oval tube geometries at lower values of Re, and the global performance criterion increases with the increase in flatness. The F1 tube shape outperforms all the examined tube designs; thus, this tube geometry suggests that it be used in energy systems.

show abstract

“…The biggest improvement in the turbulence magnitude was reached in the area within a distance of two heights of the VG from the lower wall just downstream of the VG. Other related achievements are available in the literature like Sakhri et al [18][19][20], Chamkha and Menni [21], Boursas et al [22], Chekchek et al [23], Hadidi et al [24], and Menni et al [25]. Also, Salmi et al [26] tried to enhance the convective heat transfer in CHE baffles with vortex generators.…”

Section: Introductionmentioning

confidence: 99%

Details on the Hydrothermal Characteristics within a Solar-Channel Heat-Exchanger Provided with Staggered T-Shaped Baffles

et al. 2021

Self Cite

View full text Add to dashboard Cite

Details on the hydrothermal characteristics of turbulent flows in a solar channel heat exchanger (CHE) are highlighted. The device has transverse T-shaped vortex generators (VGs). Two staggered VGs (baffles) are inserted on the lower and upper walls of the CHE. The working fluid is Newtonian and incompressible, with constant physical properties. The ANSYS Fluent 17.0 is utilized in this survey. The second-order upwind and QUICK schemes were utilized to perform the discretization of pressure and convective terms, respectively. The SIMPLE algorithm was employed to achieve the speed-pressure coupling. The residual target 10−9 was selected as a convergence criterion. The effects of the T-VGs’ geometrical shape and Reynolds numbers were inspected. At the baffle level, the wall effect was augmented due to the reduction of the passage area of flows, which is estimated here to be 55%, resulting thus in a considerable resistance to the movement of fluid particles. The thermal distribution is highly dependent on the flow structures within the CHE. Since the fluid agitation yields an enhanced mixing, it allows thus an excellent heat transfer. The most considerable rates of thermal transfer were obtained with high Re, which resulted from the intensified mixing of fluid particles through the formation of recirculation cells and the interaction with the walls of the T-VGs and the CHE. The T-baffles with intense flow rates yielded negative turbulent speeds and intensify the fluid agitation, which improves the thermal exchange rates.

show abstract

Enhanced Heat Transfer by Oil/Multi-Walled Carbon Nano-Tubes Nanofluid

Cited by 6 publications

References 36 publications

Numerical Study of a Basin Type Solar Still with a Double Glass Cover Under Winter Conditions

Numerical Study of a Basin Type Solar Still with a Double Glass Cover Under Winter Conditions

Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes

Details on the Hydrothermal Characteristics within a Solar-Channel Heat-Exchanger Provided with Staggered T-Shaped Baffles

Contact Info

Product

Resources

About