Long-Term Retardation of Water Evaporation by Ultra-Thin Layers of Polydimethylsiloxanes in the Indoor Conditions

• Autorzy: Zhuk Volodymyr , Rehush Andriy , Burchenya Sofiya , Hrytsiv Oleh

Identyfikatory

DOI

10.12911/22998993/140361

• Języki publikacji: EN

Abstrakty

EN

Global climate change is causing water imbalances in many regions of the world to exceed evaporation over rainfall, leading to negative environmental consequences and economic losses. An effective way to reduce the water loss due to evaporation from the free surface of water bodies is the use of ultra-thin surface films of special additives. Insufficient stability and significant cost of additives based on fatty alcohols (hexadecanol, octadecanol and their mixtures) necessitate searching for new effective and more economical additives to reduce the water loss due to evaporation. A series of long-term (84 day) experimental studies of the effect of ultra-thin layers of polydimethylsiloxanes PDMS100 and PDMS-200 with a thickness of 1 μm on the rate of evaporation of water from the free surface was conducted under the indoor laboratory conditions. Both the dynamics of change in time of daily values of the effect of evaporation retardation by PDMS films, and total effect from the beginning of experiment were obtained. The maximum daily effects of evaporation retardation were obtained on the 6th day of the study; they are 39.5% for the PDMS-200 film and 32.9% for the PDMS-100 film, respectively. Linear correlations are obtained between the values of the mass transfer coefficient and the free surface temperature for water without additives, as well as for the same free surfaces with ultra-thin PDMS films. Overall integral efficiency of evaporation retardation by the PDMS-200 film with a thickness of 1 μm for 84 days was equal to 17.2%, while for the PDMS-100 film of the same thickness a reduction of evaporation by 5.7% was obtained. Due to the long-term activity, ultra-thin films of polydimethylsiloxanes, especially PDMS-200, can be a profitable alternative to the use of monolayers based on fatty alcohols.

Słowa kluczowe

EN

evaporation; retardation; mass exchange coefficient; monolayer; polydimethylsiloxane; ultrathin layer; water balance

• Wydawca: Polskie Towarzystwo Inżynierii Ekologicznej ; Lublin University of Technology
• Czasopismo: Journal of Ecological Engineering
• Rocznik: 2021
• Tom: Vol. 22, nr 8
• Strony: 33--40
• Opis fizyczny: Bibliogr. 22 poz., rys.

Twórcy

autor

Zhuk Volodymyr

• Institute of Civil Engineering and Building Systems, Lviv Polytechnic National University, Karpinsky Str. 6, Lviv, Ukraine

• https://orcid.org/0000-0002-2275-0799

autor

Rehush Andriy

• Faculty of Building and Architecture, Lviv National Agrarian University, V. Velykyi Str. 1, Dubliany, Lviv region, Ukraine

• https://orcid.org/0000-0003-1427-4515

autor

Burchenya Sofiya

• Faculty of Building and Architecture, Lviv National Agrarian University, V. Velykyi Str. 1, Dubliany, Lviv region, Ukraine

• https://orcid.org/0000-0002-6903-1134

autor

Hrytsiv Oleh

• Galio Ltd, Antonych Str. 20v, Lviv, Ukraine

• https://orcid.org/0000-0003-4360-8772

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