Advanced Study of Spray Cooling: From Theories to Applications

Zhang, Tianshi; Mo, Ziming; Xu, Xiaoyu; Liu, Xiaoyan; Chen, Haopeng; Han, Zhiwu; Yan, Yuying; Jin, Yingai

doi:10.3390/en15239219

Cited by 27 publications

(5 citation statements)

References 147 publications

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“…The critical heat flux of spray cooling can reach 1000 W/cm 2 , which is much larger than that of water cooling (Zhang et al 2022). Various characteristics of the spray such as spray distance have a significant effect on critical heat flux (Lin et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Characterization of droplet bag-stamen breakup under shear effect

Gao,

Ji,

Zhou

et al. 2024

Preprint

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We conducted an experimental study of droplet breakup under shear effect at different Weg and Wed conditions, and observed and measured the morphology of droplet bag-stamen breakup which represents a case where bag and stamen structures occur simultaneously during droplet fragmentation under shear effect, the deformation pattern, and the size distribution of its sub-droplets by the continuous jet method. Through the observation of the morphology, two bag-stamen breakup variants with different manifestations under shear effect were named; the empirical formulas for predicting the deformation of droplets affected by Weg in shear flow were summarized; the sub-droplet size distributions of droplets after breakup in shear flow were statistically analyzed, and the size distributions of the fragment at Wed = 20 basically conformed to the log-normal unimodal fit, and with the increase of Weg, the single peak size distribution of the fragment was found to be very similar to the single peak fit of Weg. With the increase of Weg, the single-peak structure showed a tendency of weakening and then strengthening, and at the same time, the single-peak position moved to the direction of increasing sub-droplet size.

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Section: Introductionmentioning

confidence: 99%

Characterization of droplet bag-stamen breakup under shear effect

Gao,

Ji,

Zhou

et al. 2024

Preprint

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“…Droplet evaporation on rough surfaces is a ubiquitous phenomenon of great interest owing to its importance in novel technologies related to microspray cooling, , self-assembly, , crystallization, medical diagnoses, DNA stretching and mapping, , etc. A thorough understanding of the underlying mechanisms of droplet evaporation on rough surfaces is fundamental to resolving key design issues in these and many other applications, for example, in the context of crystals production, it enables the creation of tailor-made structures toward the fabrication of smart materials and surface with high-efficiency heat transfer. − …”

Section: Introductionmentioning

confidence: 99%

Evaporation Dynamics of Macro- and Nanodroplets on Heated Hydrophilic Rough Substrates: The Effect of Roughness and Scale

Li,

Liu,

Guo

et al. 2024

Langmuir

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Droplet evaporation on rough substrates plays an essential role in cooling and micro/nanoparticle assembly. Currently, there are numerous macroscopic experiments and theoretical models to investigate the droplet evaporation behavior on rough substrates. However, due to the complexity of this phenomenon, understanding its mechanisms solely through macroscale studies is difficult. To this end, molecular dynamics simulations of the models with distinct roughness factors are performed, and the obtained results are compared with those of relevant experiments of droplet evaporation on three hydrophilic substrates with different roughness average of 0.1, 0.15, and 0.2 μm, respectively. In this way, we assess the evaporation on these rough systems and the effect of scale on macro-and nanodroplets, which allows us to explore deeper the mechanism of droplet evaporation on rough hydrophilic substrates. In particular, we find that in the case of macroscale droplets, the evaporation mode remains the same with increasing roughness, pointing to a combined mixed and constant-contact-radius (CCR) mode. In the case of nanoscale droplets, the evaporation model is the constant-contact-angle mode when the roughness factor r = 1, while the mixed and CCR modes are found for r = 1.5 and 2, respectively. The scale effect has significant influence on the evaporation pattern of droplets on rough hydrophilic substrates. Moreover, it is also found that increasing the roughness of substrates expands the substrate−droplet contact area on both the macro-and nanoscale, which in turn enhances the heat transfer from the substrate toward the droplet. We anticipate that this first systematic analysis of scale effects provides further insights into the evaporation dynamics of droplets on rough hydrophilic substrates and has significant implications for the advancement of nanotechnology.

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“…According to Cheng et al [16], the nozzle affects the spray characteristics and heat transfer performance. Therefore, there is a great deal of work concerning the effect of various nozzle features, such as nozzle height [17], nozzle cross-section area [18], the number of nozzles [19], and many others, which can be found in [20], on heat transfer and overall nozzle performance.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nozzle Configuration on Adsorption-Chiller Performance

Kalawa,

Sztekler,

Kozaczuk

et al. 2024

Energies

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Broadly defined climate protection is a powerful incentive in the search for environmentally friendly refrigeration technologies. Adsorption chillers are considered to be one such technology; however, their main disadvantages include a low cooling capacity, a low energy efficiency ratio (EER), and cyclic operation. Thus, a great deal of effort is being put into improving adsorption-chiller performance. In this paper, the influence of the spray angle, the number of nozzles, and the water flow rate through the nozzles on adsorption-chiller performance was investigated. Adsorption-chiller performance was investigated mainly in terms of the cooling capacity (CC), the energy efficiency ratio (EER), and the specific cooling power (SCP). The results indicated that the chiller’s cooling capacity increased from about 210 W to 316 W and that the EER increased from 0.110 to 0.167 when the spray angle of the nozzles was increased from 90° to 120°. It was also reported that increasing the flow rate of water through the nozzles did not improve the average cooling capacity or the other performance parameters but resulted in more stable operation of the chiller. Additionally, using six nozzles instead of three improved the average cooling capacity and EER tenfold.

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Advanced Study of Spray Cooling: From Theories to Applications

Cited by 27 publications

References 147 publications

Characterization of droplet bag-stamen breakup under shear effect

Characterization of droplet bag-stamen breakup under shear effect

Evaporation Dynamics of Macro- and Nanodroplets on Heated Hydrophilic Rough Substrates: The Effect of Roughness and Scale

The Effect of Nozzle Configuration on Adsorption-Chiller Performance

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