Effect of absorber plate surface shape and glass cover inclination angle on the performance of a passive solar still

Goshayeshi, Hamid Reza; Safaei, Mohammad Reza

doi:10.1108/hff-01-2019-0018

Cited by 69 publications

(18 citation statements)

References 45 publications

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“…As observed, both h and h avg for the smooth plate and triangular corrugations increase monotonically with an increase in ϕ . Similarly, it was explored that the heat transfer performance of solar is still intensified as the inclination angle increases 40 . The h avg results of the smooth plate and the triangular corrugation increase by 11.2% and 10.3% with the range of ϕ = 30° to 75°.…”

Section: Resultsmentioning

confidence: 99%

“…Pavlenko et al 39 discovered ribbed plates have a huge influence on the film spreading and distribution of cryogenic liquid nitrogen, particularly at low flow rates. Goshayeshi and Safaei 40 showed the convex absorber plate can intensify heat transfer compared with the flat type. The aqueous solution containing nanoparticles flow on the corrugated plate was measured by Goodarzi et al 41 The vertical chevron corrugated plate is able to improve the wettability and enhance heat transfer under the absorption–evaporation process 42 .…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of the falling film wettability and heat transfer on the inclined plates with different corrugated structures

Wan

2021

Asia-Pacific J Chem Eng

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In this study, 2D and 3D models of corrugated plates using the volume of fluid (VOF) model were set up to simulate the influence of corrugated structure on the wettability and heat transfer. The results show that compared with the triangular corrugation, the rectangular corrugation has a slower growth rate of wetting ratio (WR) as the Weber number (We) increases under the same corrugation length Le and corrugation depth De. The average WR of the triangular corrugation is 2.8% less than that of the smooth plate. For the triangular corrugation, the higher Le contributes to improving wettability, but the average heat transfer coefficient havg first decreases to the minimum at Le = 5 mm and then increases 8% to 9% to a steady value until Le = 8 mm. WR decreases with De at We ≤ 0.76. A WR correlation considering the corrugation steepness St (St = De/Le) and a critical Re correlation corresponding to the minimum wetting rate were fitted for the liquid oxygen. As the inclination angle ϕ increases, the average film thickness decreases and havg increases until ϕ = 75°, while the variation rate slows down afterwards. At Re = 1200, havg has a decreasing trend at St ≤ 0.13, increases at St ≥ 0.14 and reaches a plateau after St = 0.24 as St increases. It increases by 30.6%, 47.4%, and 44.4% for the inclination angle ϕ = 30°, 60°, 90° cases from St = 0.14 to 0.24. The enhancement is caused by the vortices existing at St ≥ 0.14.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical study of the falling film wettability and heat transfer on the inclined plates with different corrugated structures

Wan

2021

Asia-Pacific J Chem Eng

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“…Many laboratory, theoretical and numerical studies have been done to investigate the flow field in the ejector so far. Using the computational fluid dynamics (CFD) technique reduces the complexity and cost of empirical works (Pourmahmoud et al , 2014b; Hoseinzadeh et al , 2019, 2019; Sohani et al , 2016; Pourmahmoud et al , 2014c; Goshayeshi and Safaei, 2019; Hooman et al , 2019; Sabour et al , 2017; Pourmahmoud et al , 2014a; Hassanzadeh et al , 2017). Ejector or injector, the equipment that can transfer the flow of gas, liquid or solid, such as powders, granules and sludge by creating a vacuum (Hoseinzadeh et al , 2020a; Pourmahmoud et al , 2014a; Bahrami et al , 2019).…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis of the effect of throat diameter on the fluid flow and performance of ejector

Salehi

Pourmahmoud

Hassanzadeh

et al. 2020

HFF

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Purpose Using the computational fluid dynamics (CFD) technique, this paper aims to investigate the influence of key parameters such as throat diameter; the suction ratio on the flow field behaviors such as Mach number; pressure; and temperature. Design/methodology/approach To investigate the effect of throat diameter, it is simulated for 4, 6, 8 and 10 mm as throat diameters. The governing equations have been solved by standard code of Fluent Software together with a compressible 2 D symmetric and turbulence model with the standard k–ε model. First, the influence of the throat diameter is investigated by keeping the inlet mass flow constant. Findings The results show that a place of shock wave creation is changed by changing the throat diameter. The obtained results illustrate that the maximum amount of Mach number is dependent on the throat diameter. It is obtained from the results that for smaller throats higher Mach numbers can be obtained. Therefore, for mixing purposes smaller throats and for exhausting bigger throats seems to be appropriate. Originality/value The obtained numerical results are compared to the existing experimental ones which show good agreement.

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“…Their results show that the dipole-dipole interaction of ions contributes to the reduction of interfacial energy by adding the EDL effect. There have also been recent studies in the field that address similar issues [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nanoparticle Shape and Microchannel Geometry on Fluid Flow and Heat Transfer in a Porous Microchannel

2020

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Microchannels are widely used in electrical and medical industries to improve the heat transfer of the cooling devices. In this paper, the fluid flow and heat transfer of water–Al2O3 nanofluids (NF) were numerically investigated considering the nanoparticle shape and different cross-sections of a porous microchannel. Spherical, cubic, and cylindrical shapes of the nanoparticle as well as circular, square, and triangular cross-sections of the microchannel were considered in the simulation. The finite volume method and the SIMPLE algorithm have been employed to solve the conservation equations numerically, and the k-ε turbulence model has been used to simulate the turbulence fluid flow. The models were simulated at Reynolds number ranging from 3000 to 9000, the nanoparticle volume fraction ranging from 1 to 3, and a porosity coefficient of 0.7. The results indicate that the average Nusselt number (Nuave) increases and the friction coefficient decreases with an increment in the Re for all cases. In addition, the rate of heat transfer in microchannels with triangular and circular cross-sections is reduced with growing Re values and concentration. The spherical nanoparticle leads to maximum heat transfer in the circular and triangular cross-sections. The heat transfer growth for these two cases are about 102.5% and 162.7%, respectively, which were obtained at a Reynolds number and concentration of 9000 and 3%, respectively. However, in the square cross-section, the maximum heat transfer increment was obtained using cylindrical nanoparticles, and it is equal to 80.2%.

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Effect of absorber plate surface shape and glass cover inclination angle on the performance of a passive solar still

Cited by 69 publications

References 45 publications

Numerical study of the falling film wettability and heat transfer on the inclined plates with different corrugated structures

Numerical study of the falling film wettability and heat transfer on the inclined plates with different corrugated structures

Computational fluid dynamics analysis of the effect of throat diameter on the fluid flow and performance of ejector

The Effect of Nanoparticle Shape and Microchannel Geometry on Fluid Flow and Heat Transfer in a Porous Microchannel

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