A CFD study on the evaporative cooling of a water droplet located in a duct

The current numerical study aimed for analayzing heat transfer of a spherical water droplet placed in a rectangular duct. The problem particularly deals with air-cooling of the droplet. The computational fluid dynamic technique is used to treat the problem. In order to study the problem, the effect of evaporation on the droplet's heat transfer is taken into consideration to make the problem more realistic. Moreover, various parameters like the inlet velocity and the temperature of the upstream are numerically checked. It is found out that with involving evaporation, the mean temperature of the droplets increases in comparison with the case that there is no evaporation involved. The outcomes of the current study offer useful and deep insight into the evaporative cooling of a water droplet.

A Dynamic Technique of Oral Rehabilization Using Fixed Prosthesis and CSC Telescopic Denture for Severe Advanced Periodontitis with Secondary Occlusal Traumatism – A Long-term Case Report

Clinical reports of many literatures had documented that meticulous non-surgical periodontal therapy (NSPT) and combined with periodontal prosthesis application might not only improve periodontal parameters, but also provide effective reduction of microbiological organisms associated with periodontal pathogen. A 54-year old female individual visited with chief complains of gingival bleeding and mobile teeth, and recurrent periodontal abscess over # 13, # 11, # 21, and # 22. Periapical radiographs disclosed moderate periodontal bone loss on the total remained teeth of maxilla and mandible arches. A diagnosis of generalized severe advanced periodontitis (SAP) with secondary occlusal traumatism (SOT) was established. This present case was to document the treatment of a 6 years longitudinally retrospective evaluation of case affected SAP with SOT using treatment of the combination of periodontal and perio-prosthetic design. Results showed that the remarkable improvement of periodontal tissues, reconstruction of posterior bite occlusion and recovery of esthetic appearance. It can be concluded that the Sandwich’s technique in treating patients affected SAP with SOT is an effective and valuable option.

A Comparative Study on Cu2+, Zn2+, Ni2+, Fe3+, and Cr3+ Metal Ions Removal from Industrial Wastewaters by Chitosan-Based Composite Cryogels

Materials coming from renewable resources have drawn recently an increased attention in various applications as an eco-friendly alternative in the synthesis of novel functional materials. Polysaccharides, with their prominent representative – chitosan (CS), are well-known for their sorption properties, being able to remove metal ions from dilute solutions either by electrostatic interactions or chelation. In this context, we proposed here a comparative study on Cu2+, Zn2+, Ni2+, Fe3+, and Cr3+ metal ions removal from industrial wastewaters by CS-based composite cryogels using batch technique. The composite cryogels consisting of CS embedding a natural zeolite, namely clinoptilolite, were synthesized by cryogelation, and their sorption performance were compared to those of CS cryogels and of acid-activated zeolite. A deeper analysis of thermodynamics and kinetics sorption data was performed to get insights into the sorption mechanism of all metal ions onto sorbents. Based on the optimized sorption conditions, the removal of the above-mentioned ions from aqueous solutions by the composite sorbent using dynamic technique was also evaluated.

Assessing the thermal degradation of bonded joints in flat ceramic tiles of building facades by numerical and experimental dynamic analysis

Flat ceramic tiles are widely used as protective and aesthetic construction elements in urban building facades. Under the effect of extreme temperatures from the weather seasonality, bonded joints of these tiles undergo thermal cycle’s loads. In this work, a dynamic technique based on vibration metrology is implemented. This procedure consists in the analysis of accelerograms obtained in bonded ceramic tiles from low-intensity impact loads. A corresponding study carried out with finite element modelling allowed an accurate calibration of mechanical parameters of the tile/adhesive pair as well as the estimation of a vibration dissipation factor. Several test specimens subjected to a defined period of thermal cycles stressing were also analysed for the mentioned accelerogram and an expression for the ageing estimation of the mechanical properties of the bonded joints in the tiles was obtained.