Increase In Evaporation Rate Research Articles

Innovative enhancements in solar still performance: A comprehensive study on wick-absorber configurations

This study introduces a new thermo-fluid analysis of using wick-absorbers to enhance solar still performance. Three configurations of wick absorbers were tested in a conventional single-slope solar still: (i) Case I: individual wick balls, (ii) Case II: zig-zag wick pattern, and (iii) Case III: rectangular wick array (grid-like pattern). The study evaluates multiple parameters, including saline water temperature, daily water productivity, Nusselt number, Sherwood number, thermal and exergy efficiencies, water cost, and payback period. The addition of an absorbing plate with an insulation layer led to lower saline water temperatures and shifted peak values. Compared to a traditional still, wick utilization enhanced water productivity by 45.8 %, 84.5 %, and 86 % for Cases I, II, and III, respectively, due to increased evaporation rates. This resulted in a relative enhancement in daily thermal efficiency by 64 %, 76 %, and 97.5 %, respectively. Additionally, four correlations were developed to describe Nusselt and Sherwood numbers, with a maximum deviation of 25 %. Economic analysis demonstrated cost-effectiveness, significantly reducing water cost and the payback period by 37 %, 39 %, and 44 % for Cases I, II, and III, respectively, compared to the conventional system.

A numerical and experimental investigation of the impact of wire mesh on vertical solar still

One of the most pressing challenges facing human society is the lack of freshwater, Traditional desalination is energy-intensive, posing challenges in energy-scarce regions, especially in less developed nations. Solar stills are a promising alternative but face efficiency limits due to design constraints. Previous studies have employed techniques like integrating reflectors and combining them with other solar still to enhance the evaporation section, but these have resulted in bulky and space-consuming vertical solar still (VSS) designs. This research proposes and evaluates a new vertical solar still (VSS) design to boost freshwater production by increasing evaporation rates. The study uses numerical simulations with Fluent 18.2 and indoor experiments to evaluate the new VSS design. The proposed VSS design introduces a wire mesh plate as an expanded surface behind the wick, improving heat and mass transfer processes at three distinct radiation rates (in two designs: fully mesh plate and partially mesh plate). The study shows that the fully mesh VSS design can boost efficiency by 10.72%, producing 1384 of freshwater, while the partially mesh VSS design can increase efficiency by 6.2%, yielding 1328 . Wire mesh technology effectively enhances evaporation rates, addressing desalination energy challenges.

A numerical and experimental investigation of the impact of wire mesh on vertical solar still

One of the most pressing challenges facing human society is the lack of freshwater, Traditional desalination is energy-intensive, posing challenges in energy-scarce regions, especially in less developed nations. Solar stills are a promising alternative but face efficiency limits due to design constraints. Previous studies have employed techniques like integrating reflectors and combining them with other solar still to enhance the evaporation section, but these have resulted in bulky and space-consuming vertical solar still (VSS) designs. This research proposes and evaluates a new vertical solar still (VSS) design to boost freshwater production by increasing evaporation rates. The study uses numerical simulations with Fluent 18.2 and indoor experiments to evaluate the new VSS design. The proposed VSS design introduces a wire mesh plate as an expanded surface behind the wick, improving heat and mass transfer processes at three distinct radiation rates (in two designs: fully mesh plate and partially mesh plate). The study shows that the fully mesh VSS design can boost efficiency by 10.72 %, producing 1384 ccm2 of freshwater, while the partially mesh VSS design can increase efficiency by 6.2 %, yielding 1328 ccm2. Wire mesh technology effectively enhances evaporation rates, addressing desalination energy challenges.

Fish mortality in the Amazonian drought of 2023: the role of experimental biology in our response to climate change.

Higher temperatures exacerbate drought conditions by increasing evaporation rates, reducing soil moisture and altering precipitation patterns. As global temperatures rise as a result of climate change, these effects intensify, leading to more frequent and severe droughts. This link between higher temperatures and drought is particularly evident in sensitive ecosystems like the Amazon rainforest, where reduced rainfall and higher evaporation rates result in significantly lower water levels, threatening biodiversity and human livelihoods. As an example, the serious drought experienced in the Amazon basin in 2023 resulted in a significant decline in fish populations. Elevated water temperatures, reaching up to 38°C, led to mass mortality events, because these temperatures surpass the thermal tolerance of many Amazonian fish species. We know this because our group has collected data on critical thermal maxima (CTmax) for various fish species over multiple years. Additionally, warmer waters can cause hypoxia, further exacerbating fish mortality. Thus, even Amazon fish species, which have relatively high thermal tolerance, are being impacted by climate change. The Amazon drought experienced in 2023 underscores the urgent need for climate action to mitigate the devastating effects on Amazonian biodiversity. The fact that we have been able to link fish mortality events to data on the thermal tolerance of fishes emphasizes the important role of experimental biology in elucidating the mechanisms behind these events, a link that we aim to highlight in this Perspective.

Enhancing pyramid solar still performance using suspended v-steps, reflectors, Peltier cooling, forced condensation, and thermal storing materials

This work aims at enhancing the thermal efficiency of pyramid distiller solar still (PDSS). A modified version (MPDSS) was developed, featuring suspended v-steps on the vertical walls of the distiller. Additionally, the MPDSS was equipped with external reflectors (MPDSS-R) designed to concentrate solar energy, thereby potentially increasing evaporation rates. To further boost the condensation rate, three different methods were implemented and evaluated independently: an external condensation unit integrated with the MPDSS (MPDSS-C), a fixed nano-enhanced thermal storing material (NTSM) within the MPDSS (MPDSS-NTSM), and an installed Peltier device (MPDSS-P). The results indicated that the MPDSS with suspended steps achieved a significant improvement, with a 40 % increase in distillate yield over PDSS. MPDSS with reflectors resulted in a 96 % increase in yield. Moreover, integrating a Peltier device with the MPDSS led to a 148 % boost in distillate yield, while the yields increased by 139 % and 143 % when utilizing the NTSM and the condenser, respectively. Consequently, the optimal performance for the MPDSS was achieved with the combination of reflectors and the Peltier device, attaining a thermal efficiency of 53.96 % and a 148 % improvement in distillate yield. Also, the thermal efficiency of PDSS, MPDSS, MPDSS-R, MPDSS-C, MPDSS-NTSM, and MPDSS-P was 35.46 %, 42.23 %, 46.77 %, 50.89 %, 48.33 %, and 54.67 %, respectively. While the exergy efficiencies ranged from 3.44 % for the PDSS configuration to 4.87 % for the MPDSS-P configuration. Interestingly, the MPDSS-C configuration achieved an exergy efficiency of 4.64 %. The emissions for MPDSS, MPDSS-R, MPDSS-C, MPDSS-NTSM, and MPDSS-P are estimated at 15.03, 14.62, 14.09, 14.30, and 13.79 tons a year, severally. The enviroeconomic parameters were 218, 212, 204, 207, and 200 a year for MPDSS, MPDSS-R, MPDSS-C, MPDSS-NTSM, and MPDSS-P, respectively. Finally, the water expenses are as follows: $0.343/L for the PDSS, $0.292/L for the MPDSS, $0.220/L for the MPDSS-R, $0.082/L for MPDSS-P, $0.105/L for the MPDSS-C, and $0.114/L for the MPDSS-NTSM.

A novel approach to produced water management using surfactants for water-wise energy production

Evaporation can become a prominent solution for management of the large volumes of contaminated water produced each year in the energy industry. However, improvements to the evaporation rates are needed which can be accomplished through the use of surfactants. In this paper, organic and inorganic compounds commonly found in produced water were studied in a controlled, laboratory oven to understand their effect on water evaporation rate. Organic compounds were classified in three ways: as either miscible or immiscible, as having a density less than or greater than water for immiscible compounds, and by their volatility. For each sample, the evaporation rate and surface tension were measured, and correlations were made between the two. As the cationic charges of salts added to water increased from +1 to +3, the evaporation rates decreased and the surface tension increased. Monovalent cationic charges were 60% higher than solutions containing divalent or trivalent cations. From the organic compounds tested, the addition of surfactants to deionized water increased evaporation rates by more than 50% while the addition of immiscible organic compounds hindered these rates. Surfactants reduced the surface tension of these samples thus positively affecting the evaporation rates. Applying surfactants to basic salt solutions showed evaporation rates increased with the greatest being that of sodium chloride, the most common salt in produced water. Increases in salt concentrations lowered evaporation rates and increased surface tension while increases in surfactant concentrations did not necessarily continue to reduce surface tension and increase evaporation rates. When surfactants were added to produced water samples, up to a 27% increase in the rates of evaporation were observed. The quality of produced water varies from region to region and therefore some surfactants may have a greater effect in one type of water than another.

Physical Vapor Deposition of Indium-Doped GeTe: Analyzing the Evaporation Process and Kinetics

Chalcogenide glasses have broad applications in the mid-infrared optoelectronics field and as phase-change materials (PCMs) due to their unique properties. Chalcogenide glasses can have crystalline and amorphous phases, making them suitable as PCMs for reversible optical or electrical recording. This study provides an in-depth analysis of the evaporation kinetics of indium-doped chalcogenides, GeTe4 and GeTe5, using the physical vapor deposition technique on glass substrates. Our approach involved a detailed examination of the evaporation process under controlled temperature conditions, allowing precise measurement of rate changes and energy dynamics. This study revealed a significant and exponential increase in the evaporation rate of GeTe4 and GeTe5 with the introduction of indium, which was particularly noticeable at higher temperatures. This increase in evaporation rate with indium doping suggests a more complex interplay of materials at the molecular level than previously understood. Furthermore, our findings indicate that the addition of indium affects the evaporation rate and elevates the energy requirements for the evaporation process, providing new insights into the thermal dynamics of these materials. This study’s outcomes contribute significantly to understanding deposition processes, paving the way for optimized manufacturing techniques that could lead to more efficient and higher-performing optoelectronic devices and memory storage solutions.

The severity of dry eye symptoms and risk factors among university students in Saudi Arabia: a cross-sectional study

Dry eye syndrome (DES) is a tear film disorder caused by increased tear evaporation or decreased production. The heavy workload on the eye and the increased usage of digital screens may decrease blink frequency, leading to an increased evaporation rate and an upsurge in the incidence and severity of DES. This study aims to assess the severity of DES symptoms and the risk factors among university students. A cross-sectional study was conducted at Umm AlQura University to evaluate the severity of DES among students and explore its potential association with digital screen use. Validated questionnaires were used to assess the severity of DES and digital screen usage. The study included 457 participants, of which 13% had symptoms suggestive of severe DES. Furthermore, multiple risk factors had a significant association with the severity of DES, including gender, use of monitor filters, monitor and room brightness, and smoking habits. DES symptoms were prevalent among university students, particularly female students. Although there was no significant association with the duration of screen usage and collage distribution. Other factors however, such as the usage of screen monitors and the brightness of both the monitor and the room, were significantly associated with the severity of DES symptoms.

Construction of robust silica-titania polydopamine composite membrane with light-absorption property for photothermal vacuum membrane distillation

A robust silica-titania polydopamine composite membrane was fabricated adding a photothermal polydopamine coating to the surface of polypropylene membrane for photothermal vacuum membrane distillation. Detailly, the surface of an inert PP membrane was modified with atomically controllable titanium and silicon to enhance the hydroxyl groups on the membrane surface, then, a photothermal effect layer of polydopamine was generated on the composite membrane surface through the self-polymerization reaction of dopamine. The polydopamine coating has significant light absorption and heating properties, and it can act as a local heater when exposed to light sources. This local heating effect significantly raises the temperature at the membrane interface, creating a thermal gradient that drives the evaporation of water molecules. Specifically, we quantitatively analyzed the three reasons (surface energy, free radicals, and photothermal effect) for the increase in evaporation rate of the pristion PP membrane caused by the membrane composite membrane. Among these reasons, the photothermal effect caused by black polydopamine is the most important factor for improving evaporation efficiency. The dark-illumination alternating experiment revealed that the PP-TiO2-SiO2-PDA composite membrane delivered a noteworthy enhancement in vacuum membrane distillation performance (approximately 40%), while the improvement of the PP membrane was only 1.7%.

Transient analytical solution for coupled water–gas transport in unsaturated soil cover of landfill

A new analytical solution for coupled water–gas transport in unsaturated landfill cover system is proposed, which can consider transient diffusive-advective transport of gas under transient water transport condition. The proposed analytical solution is first verified against the laboratory measurements and numerical simulations. Using the proposed solution, parametric studies are conducted on the coupled transient behaviors of water–gas transport. The results show that ignoring the coupling effect can lead to significant error in gas transport results under various conditions, e.g., the surface gas emission flux is underestimated by about 28.3%∼79.8% due to ignoring the spatial and temporal variations of water content induced by transient water transport. The influencing parameters (i.e., initial saturation degree, rainfall patterns, and evaporation rate) all have significant impact on the coupled water–gas transport behaviors. The magnitude of the error induced by ignoring the coupling effect increases with increasing initial saturation degree and increasing evaporation rate (e.g., for initial saturation degree increasing from 0.35 to 0.95, the accumulated percolation at cover bottom increases by 10.9 times and the gas emission flux at cover surface decreases by 64.7%). The results highlight that it’s imperative to consider the effect of transient water transport when one needs more accurate assessment of gas transport results in the cover. This analytical solution can also be utilized to aid landfill cover design and to verify other numerical models.

Logistic curve modelling of sea surface temperature and latent heat flux variability in the Tropical Indian Ocean

The Tropical Indian Ocean (TIO) is one of the most vulnerable regions to climate change due to its unique ocean-atmosphere interactions. The region is characterized by warm temperatures, high evaporation rates, and strong convection, making it particularly vulnerable to greenhouse gases. This susceptibility leads to an overall trend of warming across the Earth's surface and atmosphere, intensifying sea surface temperatures (SST) and increasing evaporation rates, consequently influencing Surface Latent Heat Flux (SLHF). The strong influence of both SST and SLHF on atmospheric circulation and precipitation patterns makes them critical factors in determining the region's climate, particularly in monsoon-dominated regions. Analysis reveals a consistent upward trend in both SST and SLHF in the central region of TIO. To model this, standard Logistic Curve Model (LCM) has been applied to these parameters averaged over the central region of the TIO. The model is run for a period of 20 years from 2001 to 2020, grouped into four lustrums. The LCM-derived SST and SLHF are in good consistent with observed datasets during the above periods with, correlation coefficients ranging from 0.92 to 0.96 for SST and 0.86–0.90 for SLHF. Extending the model spatially across the entire TIO region explains the ability to project fluctuations in SST and SLHF values across different seasons. These findings highlight the model's relevance for capturing short-term, long-term, and seasonal variability of the parameters, providing important insights into regional climate dynamics.

The optimization of evaporation rate in graphene-water system by machine learning algorithm

Solar interfacial evaporation, as a novel practical freshwater production method, requires continuous research on how to improve the evaporation rates to increase water production. In this study, sets of data were obtained from molecule dynamics simulation and literature, in which the parameters included height, diameter, height–radius ratio, evaporation efficiency, and evaporation rate. Initially, the correlation between the four input parameters and the output of the evaporation rate was examined through traditional pairwise plots and Pearson correlation analysis, revealing weak correlations. Subsequently, the accuracy and generalization performance of the evaporation rate prediction models established by neural network and random forest were compared, with the latter demonstrating superior performance and reliability confirmed via random data extraction. Furthermore, the impact of different percentages (10%, 20%, and 30%) of the data on the model performance was explored, and the result indicated that the model performance is better when the test set is 20% and all the constructed model converge. Moreover, the mean absolute error and mean squared error of the evaporation rate prediction model for the three ratios were calculated to evaluate their performance. However, the relationship between the height- radius ratio and optimal evaporation rate was investigated using the enumeration method, and it was determined that the evaporation efficiency was optimal when the height–radius ratio was 6. Finally, the importance of height, diameter, height– radius ratio, and evaporation efficiency were calculated to optimize evaporator structure, increase evaporation rate, and facilitate the application of interfacial evaporation in solar desalination.

Solar desalination with charcoal briquettes from plants as an additional absorption sorbent

Water is the most abundant substance on Earth, but only 2.5% can be used for drinking and farming; the rest is seawater containing much salt. Solar desalination is a great tool to solve this problem for small families and remote areas. However, the disadvantage of using solar power is still the low productivity of distillate because it depends on the season, region, and intensity of solar radiation. Solar radiation heat absorbing and storing materials are a favorable solution in increasing evaporation rate, efficiency, and total distillate. Many have been developed to date, but these materials require more expenditure to be used as radiation heat sinks and stores. Charcoal derived from wood has high thermal energy absorption and porosity. Four desalination devices were used, namely using an additional absorber made from Kapok wood (Ceiba pentandra) coded CP_60, Gamal wood (Gliricidia sepium) coded GS_60, Kusambi wood (Schleichera oleosa) coded SO_60, and without additional absorber as a comparison. All desalination devices have the same shape and size, simple, with an area of 0.09 m2 each. Before the additional absorber base material is used, drying, charring, grinding, meshing, pressing, and briquetting are carried out. The test results show that the additional absorber of natural materials affects the evaporation rate, desalination efficiency, and total distillate water. The distillation device using Gamal wood (Gliricidia sepium) additional absorber material, coded GS_60, provides maximum performance such as distillate water yield every 30 minutes and total distillate 124 ml/0.09 m2, 28.19% efficiency, and evaporation rate.

Transient nucleation driven by solvent evaporation.

We theoretically investigate homogeneous crystal nucleation in a solution containing a solute and a volatile solvent. The solvent evaporates from the solution, thereby continuously increasing the concentration of the solute. We view it as an idealized model for the far-out-of-equilibrium conditions present during the liquid-state manufacturing of organic electronic devices. Our model is based on classical nucleation theory, taking the solvent to be a source of the transient conditions in which the solute drops out of the solution. Other than that, the solvent is not directly involved in the nucleation process itself. We approximately solve the kinetic master equations using a combination of Laplace transforms and singular perturbation theory, providing an analytical expression for the nucleation flux. Our results predict that (i) the nucleation flux lags slightly behind a commonly used quasi-steady-state approximation. This effect is governed by two counteracting effects originating from solvent evaporation: while a faster evaporation rate results in an increasingly larger influence of the lag time on the nucleation flux, this lag time itself is found to decrease with increasing evaporation rate. Moreover, we find that (ii) the nucleation flux and the quasi-steady-state nucleation flux are never identical, except trivially in the stationary limit, and (iii) the initial induction period of the nucleation flux, which we characterize as a generalized induction time, decreases weakly with the evaporation rate. This indicates that the relevant time scale for nucleation also decreases with an increasing evaporation rate. Our analytical theory compares favorably with results from a numerical evaluation of the governing kinetic equations.

Modeling of Impurities Evaporation Reaction Order in Aluminum Alloys by the Parametric Fitting of the Logistic Function.

Advancements in computer capabilities enable predicting process outcomes that earlier could only be assessed after post-process analyses. In aerospace and automotive industries it is important to predict parts properties before their formation from liquid alloys. In this work, the logistic function was used to predict the evaporation rates of the most detrimental impurities, if the temperature of the liquid aluminum alloy was known. Then, parameters of the logistic function were used to determine the transition points where the reaction order was changing. Samples were heated to 610 °C, 660 °C, 710 °C, and 760 °C for one hour, after which the chemical analyses were performed and evaporation rates were calculated for Cd, Hg, Pb and Zn elements. The pressure inside the encapsulated area was maintained at 0.97 kPa. Whereas parameters that define the evaporation rate increase with the temperature increase, the maximum evaporation rates were deduced from the experimental data and fitted into the logistic function. The elemental evaporation in liquid-aluminum alloys is the best defined by the logistic function, since transitions from the first to zero-order-governed evaporation reactions have nonsymmetrical evaporation rate slopes between the lowest and the highest evaporation rate point.

The Impact of Water Abstraction on River Mutonga Discharge Over the Last 30 Years

The declining water levels among rivers flowing through Tharaka Nithi County have been a major concern in the region for the last 30 years. The decline has adversely affected environmental sustainability, water resources, agriculture and the ecosystem. Understanding the relationship between rivers, change of climate and human activities are essential challenging areas. The research aimed to assess the impact of changed rainfall pattern and amount to the declining water levels in Mutonga River over years from 1990 to 2020 and it contribution to the changing water levels in river Mutonga. An exploratory survey and a correlational study were used to compile the data for this analysis. Three regional NEMA officials and three regional water resources authority officials were also surveyed, along with 270 residents in the River Mutonga area. The samples were based on 30% as per Mugenda Mugenda samples analysis. The rainfall and temperature data was acquired from the regional meteorological department based in Embu town. Data on river discharge was acquired from regional water resource authority (WRA) based in Meru town. The result may also recommend suitable practices for management of water resources and come up with disaster control measures in water sector. The local community may also benefit from the study by getting the right information on better methods of conserving water resources, the findings and recommendations from the study may be used as basis for future research related to this study. From the findings, results show that river Mutonga flows has been decreasing over the last 30 years, water abstraction trend has been rising over the entire period in three decades causing a tremendous decline in river discharge. climatic changes have been noted in the region with rainfall amount dropping significantly and temperatures increasing, this has led to decline of the river discharge due reduced rainwater adding to the rivers and increased evaporation rates which leads to loss of water from rivers to the atmosphere. The result from the research may be used to enlighten the County Government of Tharaka Nithi, in making decision, especially in development projects implementation and in the strategic plans of the County Government.

Biomimetic Structural Design of Fabric for Low‐Cost, Scalable, and Highly Efficient Off‐Grid Solar‐Driven Water Purification

AbstractInterfacial solar‐vapor generation (ISVG) is an emerging technology for water purification. However, high cost, low evaporation rate, clogging issues, and limited solar utilization under natural condictions greatly hinder its practical application. Herein, inspired by the aligned microstructure of dragonfly wings, a 3D microarray structure composed of vertically aligned hierarchical and hydrophilic carbon fibers (CFs) is constructed using a scalable fiber manufacturing technology. The microarray structure of the high‐thermal‐conductivity CFs with nanocapillaries contributes to the fast mass (steam and salt ions) and heat transfer as well as high omnidirectional light absorption. More importantly, due to the strong multiscale capillary effect, the formed 3D water evaporation surface containing abundant micro‐meniscuses and nanoscale thin water layers in the CFs arrays effectively reduces the evaporation enthalpy and creates more water/air interfaces, leading to the significant increasing evaporation rate. As a result, a high evaporation rate of 2.21 kg m−2 h−1 under one‐sun irradiation can be achieved. Moreover, the off‐grid water treatment device assembled with multiple 3D CFs‐based customized spherical evaporators can obtain a high pure water collection of 10.71 kg m−2 per day without salt accumulation under real environmental conditions. This work demonstrates a high‐efficiency, cost‐effective, and scalable strategy for high‐performance ISVG.

Glacial Lakes of Mongolia

The over 2200 lakes of Mongolia are generally poorly studied, particularly the glacial lakes. This overview study presents a classification of the glacial lakes based on tectonic-geological and geomorphological dynamics. Selected representative lakes are described using results from fieldwork and satellite image analysis, including bathymetry, paleoshorelines, and recent lake-level fluctuations between 1987 and 2020. Generally, lake levels dropped from the early Holocene until recently, with the onset of the climate change-driven glacier recession that has resulted in lake-level rises and area expansion in almost all moraine-dammed, tongue-basin, and ice-contact lakes. In contrast, endorheic lakes have mainly been shrinking for the past forty years because of an increase in air temperature and evaporation rates and the effects of an intensifying water use within the catchment for irrigation, mining, and hydroelectric energy production in the form of dams. The creation of a lake monitoring system based on an in-depth inventory is recommended.

Solar parallel feed multi effect distillation plant: An experimental study

This paper discusses about the parametric studies carried out on 10 m3/day capacity multi effect distillation desalination plant. In the present work studies were performed to determine the effect of process parameters on the production capacity of the MED plant. GOR of plant is around 3.6. Effect of solar irradiation on the evaporation rate in each effect is determined and presented with respect to time. Influence of the operating pressure and temperature on the performance of each effect is measured during the experiment and presented in the current work. Influence of steam input on the system performance is discussed. It was observed that increase in solar irradiation influences the steam production. Increase in the steam production rate influences GOR. Increase in the solar irradiation by 24% maximum on a typical day resulted in increase of evaporation rate by 20.6%, 17.3%, 15.7% and 12.3% corresponding to the effect 1, 2, 3 and 4 respectively. It was also observed that the production rate is found to be higher after the mid noon compared to the forenoon even though the solar irradiation is measured to be comparatively higher in forenoon than after mid noon.

EXPERIMENTAL INVESTIGATION OF THE RESUSPENDED NANOFLUID DROPLET EVAPORATION AT PERIODICALLY VARYING ELECTRIC FIELD

The addition of nanoparticles can significantly increase the evaporation rate of droplets. However, there is still no consistent conclusion on whether the factor promoting droplet evaporation is the motion of suspended nanoparticles or the deposited nanoparticles changing the structure of the solid surface. Therefore, the fully deposited surfaces were prepared by drying 0.005-0.015 vol.% Al<sub>2</sub>O<sub>3</sub>-water nanofluids and the resuspension process of nanoparticles was investigated by applying periodically varying electric field. The mechanism of nanoparticle influence on the droplet evaporation process was investigated by measuring the contact angle, droplet height, and contact surface radius. The results show that the motion of suspended nanoparticles promotes the droplet evaporation. The evaporation time of droplets on the nanoparticle-deposited surface is longer than that on the nondeposited surface without electric field, while the trend is opposite in the presence of the electric field. After the electric field is applied, the nanoparticles are resuspended into the droplet due to the instability of the deposition layer structure. The motion of nanoparticles leads to an increase in the droplet evaporation rate, and the enhancement effect is optimal when the electric field switching frequency is 90 Hz.