Effects of nanoparticles on nanofluid droplet evaporation

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

“…A fundamental process like droplet evaporation which is widely observed in day to day life holds a pivotal role in many technical applications, including DNA/RNA micro-array deposition [1,2], inkjet printing [3,4], microelectronics cooling [5][6][7], combustion [8,9] and metrology [10][11][12]. In such technologies, the evaporation rate is a key contributor to the overall system efficiency -as it dictates the droplet lifetime and corresponding rates of heat and mass transfer.…”

Propose a Correlation to Approximate Nanofluids‟ Enthalpy of Vaporization - A Numerical Study

“…After studying published experimental data of Gan and Qiao [13] and Chen et al [12], following model (equation (5)) was proposed by authors to approximate this property. This model is based on this assumption that the nanofluid behaves more like a fluid rather than a conventional solid-fluid mixture [23].…”

“…Sefiane and Bennacer [11] found a reduction during the pinning phase in sessile droplet evaporation rate with presence of Aluminum nanoparticles compared to its base fluid, ethanol. Chen et al [12] Considering five different types of nanoparticles, Moghiman and Aslani [14] found that depending on type of nanopartilces, evaporation rate of free-surface water may be enhanced or slowed down.…”

“…According to D 2 -law, evaporation rate of a single liquid droplet is inversely proportional to the enthalpy of vaporization [12]. If it is possible to estimate the effect of nanoparticles addition on heat of vaporization of base fluid, then influence of nanoparticles on evaporation characteristics of the base fluid can be predicted.…”

Wettability Effects on Heat Transfer

“…Especially, the nano-particle deposited surface shows superhydrophilic characteristics. Based on this good wetting property, several studies for the evaporation of a nanofluid have been conducted (Leeladhar et al, 2009;Sefiane & Bennacer, 2009;Chen et al, 2010). The initial equilibrium contact angle of the nanofluids was significantly affected by the nanoparticle sizes and concentrations.…”