Understanding and enhancing the direct contact membrane distillation performance by modified heat transfer correlation

2020 ◽  
Vol 98 (12) ◽  
pp. 2599-2617
Author(s):  
Emadadeen Ali ◽  
Mohamed Hadj‐Kali ◽  
Jamel Orfi
Keyword(s):  
Heat Transfer ◽  
Direct Contact ◽  
Membrane Distillation ◽  
Heat Transfer Correlation ◽  
Direct Contact Membrane Distillation

Experimental Investigation of Heat Transfer Correlation for Direct Contact Membrane Distillation

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Quoc Linh Ve ◽  
Kawtar Rahaoui ◽  
Mohammed Bawahab ◽  
Hosam Faqeha ◽  
Abhijit Date ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Direct Contact ◽  
Membrane Distillation ◽  
Copper Plate ◽  
Heat Transfer Correlation ◽  
Hydrophobic Membrane ◽  
Flow Channels ◽  
Direct Contact Membrane Distillation ◽  
Turbulent Flow Regime

Abstract This paper presents an experimental investigation of heat transfer in direct contact membrane distillation (DCMD) flow channels with and without the spacer. In this experiment, the usual hydrophobic membrane of DCMD is replaced by a copper plate to eliminate mass transfer. The study shows the most appropriate heat transfer correlations for empty channel cases with different channel heights and flow rates. For the case with the spacer in the flow channels, two spacer materials are investigated: nonwoven plastic and woven stainless steel. The paper presents the most appropriate heat transfer correlation for both these spacer materials. Further, the paper presents finding with two more spacer materials, woven fiberglass and aluminum spacer. It is found that the most appropriate heat transfer correlation for these materials is in the turbulent flow regime although the experimentally estimated Reynolds number suggests laminar flow is presented.

scholarly journals An experimental heat transfer investigation of using spacer in direct contact membrane distillation

2019 ◽  
Vol 160 ◽  
pp. 223-230 ◽  
Author(s):  
Quoc Linh Ve ◽  
Kawtar Rahaoui ◽  
Mohammed Bawahab ◽  
Hosam Faqeha ◽  
Abhijit Date ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Direct Contact ◽  
Membrane Distillation ◽  
Experimental Heat ◽  
Direct Contact Membrane Distillation ◽  
Experimental Heat Transfer

scholarly journals The Effect of Inclination Angle and Reynolds Number on the Performance of a Direct Contact Membrane Distillation (DCMD) Process

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2824 ◽  
Author(s):  
Adnan Alhathal Alanezi ◽  
Mohammad Reza Safaei ◽  
Marjan Goodarzi ◽  
Yasser Elhenawy
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Inclination Angle ◽  
Temperature Difference ◽  
Direct Contact ◽  
Numerical Study ◽  
Reynolds Numbers ◽  
Membrane Distillation ◽  
Number Range ◽  
Direct Contact Membrane Distillation

In this numerical study, a direct contact membrane distillation (DCMD) system has been modeled considering various angles for the membrane unit and the Reynolds number range of 500 to 2000. A two-dimensional model developed based on the Navier–Stokes, energy, and species transport equations were used. The governing equations were solved using the finite volume method (FVM). The results showed that with an increase in the Reynolds number of up to 1500, the heat transfer coefficient for all membrane angles increases, except for the inclination angle of 60°. Also, an increase in the membrane angle up to 90° causes the exit influence to diminish and the heat transfer to be augmented. Such findings revealed that the membrane inclination angle of 90° (referred to as the vertical membrane) with Reynolds number 2000 could potentially have the lowest temperature difference. Likewise, within the Reynolds numbers of 1000 and 2000, by changing the inclination angle of the membrane, temperature difference remains constant, however, for Reynolds numbers up to 500, the temperature difference reduces intensively.

Omniphobic palygorskite coated Janus membrane with enhanced fouling and wetting resistance for direct contact membrane distillation

Desalination ◽  
2021 ◽  
Vol 505 ◽  
pp. 114986
Author(s):  
Jiahui Zhang ◽  
Nan Li ◽  
Dong Wang ◽  
Jinmei Li ◽  
Yue Chen ◽  
...  
Keyword(s):  
Direct Contact ◽  
Membrane Distillation ◽  
Direct Contact Membrane Distillation

scholarly journals Concentration of Bioactive Phenolic Compounds in Olive Mill Wastewater by Direct Contact Membrane Distillation

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1808
Author(s):  
Rosa Tundis ◽  
Carmela Conidi ◽  
Monica R. Loizzo ◽  
Vincenzo Sicari ◽  
Rosa Romeo ◽  
...  
Keyword(s):  
Direct Contact ◽  
High Performance ◽  
Biological Properties ◽  
Membrane Distillation ◽  
Olive Mill Wastewater ◽  
High Concentration ◽  
Direct Contact Membrane Distillation ◽  
Reducing Activity ◽  
Β Carotene ◽  
Olive Mill

Olive mill wastewater (OMW), generated as a by-product of olive oil production, is considered one of the most polluting effluents produced by the agro-food industry, due to its high concentration of organic matter and nutrients. However, OMW is rich in several polyphenols, representing compounds with remarkable biological properties. This study aimed to analyze the chemical profile as well as the antioxidant and anti-obesity properties of concentrated fractions obtained from microfiltered OMW treated by direct contact membrane distillation (DCMD). Ultra-high performance liquid chromatography (UHPLC) analyses were applied to quantify some phenols selected as phytochemical markers. Moreover, α-Amylase, α-glucosidase, and lipase inhibitory activity were investigated together with the antioxidant activity by means of assays, namely β-carotene bleaching, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic) acid (ABTS) diammonium salts, 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, and Ferric Reducing Activity Power (FRAP) tests. MD retentate—which has content of about five times greater of hydroxytyrosol and verbascoside and about 7 times greater of oleuropein than the feed—was more active as an antioxidant in all applied assays. Of interest is the result obtained in the DPPH test (an inhibitory concentration 50% (IC50) of 9.8 μg/mL in comparison to the feed (IC50 of 97.2 μg/mL)) and in the ABTS assay (an IC50 of 0.4 μg/mL in comparison to the feed (IC50 of 1.2 μg/mL)).

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