Evaluation of the Performance of the Drag Force Model in Predicting Droplet Evaporation for R134a Single Droplet and Spray Characteristics for R134a Flashing Spray

Zhou, Zhifu; Zhu, Dong-Qing; Lu, Guanyu; Chen, Bin; Wu, Wei‐Tao; Li, Yu-Bai

doi:10.3390/en12244618

Cited by 9 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They show that the Schiller–Naumann and the Morsi‐Alexander models are superior to the Syamlal–O'Brien‐Symmetric model in an Euler–Euler simulation of particle mixing and segregation in a rotating cylinder. A more recent study of Zhou et al (2019) reveals that other drag models perform similarly and are not superior to the Schiller–Naumann model.…”

Section: Methodsmentioning

confidence: 97%

Scale‐up analysis of geometrically dissimilar single‐use bioreactors

Kreitmayer,

Gopireddy,

Aki

et al. 2023

Biotech & Bioengineering

View full text Add to dashboard Cite

Cell culture scale‐up is a challenging task due to the simultaneous change of multiple hydrodynamic process characteristics and their different dependencies on the bioreactor size as well as variation in the requirements of individual cell lines. Conventionally, the volumetric power input is the most common parameter to select the impeller speed for scale‐up, however, it is well reported that this approach fails when there are huge differences in bioreactor scales. In this study, different scale‐up criteria are evaluated. At first, different hydrodynamic characteristics are assessed using computational fluid dynamics data for four single‐use bioreactors, the Mobius® CellReady 3 L, the Xcellerex™ XDR‐10, the Xcellerex™ XDR‐200, and the Xcellerex™ XDR‐2000. On the basis of this numerical data, several potential scale‐up criteria such as volumetric power input, impeller tip speed, mixing time, maximum hydrodynamic stress, and average strain rate in the impeller zone are evaluated. Out of all these criteria, the latter is found to be most appropriate, and the successful scale‐up from 3 to 10 L bioreactor and to 200 L bioreactor is confirmed with cell culture experiments using Chinese Hamster Ovary cell cultivation.

show abstract

Section: Methodsmentioning

confidence: 97%

Scale‐up analysis of geometrically dissimilar single‐use bioreactors

Kreitmayer,

Gopireddy,

Aki

et al. 2023

Biotech & Bioengineering

View full text Add to dashboard Cite

show abstract

“…To improve the performance of energy system components, it is necessary to carry out a more detailed investigation of the parameters of refrigerant evaporation and condensation. The evaporation of R134a refrigerant droplets was modelled by Zhou et al [13]. The modeling results in [13] indicate that using a nozzle with a smaller diameter reduces the penetration depth of the aerosol flow, the size of a droplet, and its velocity.…”

Section: Introductionmentioning

confidence: 99%

“…The evaporation of R134a refrigerant droplets was modelled by Zhou et al [13]. The modeling results in [13] indicate that using a nozzle with a smaller diameter reduces the penetration depth of the aerosol flow, the size of a droplet, and its velocity. The research findings [14] reveal that the rate of evaporation and boiling heat transfer can be increased by the interaction of easily broken bubbles.…”

Section: Introductionmentioning

confidence: 99%

Collisions of Two-Phase Liquid Droplets in a Heated Gas Medium

Tkachenko

Shlegel

Стрижак

2021

Entropy

View full text Add to dashboard Cite

The paper presents the experimental research findings for the integral characteristics of processes developing when two-phase liquid droplets collide in a heated gas medium. The experiments were conducted in a closed heat exchange chamber space filled with air. The gas medium was heated to 400–500 °C by an induction system. In the experiments, the size of initial droplets, their velocities and impact angles were varied in the ranges typical of industrial applications. The main varied parameter was the percentage of vapor (volume of bubbles) in the droplet (up to 90% of the liquid volume). The droplet collision regimes (coalescence, bounce, breakup, disruption), size and number of secondary fragments, as well as the relative volume fraction of vapor bubbles in them were recorded. Differences in the collision regimes and in the distribution of secondary fragments by size were identified. The areas of liquid surface before and after the initial droplet breakup were determined. Conditions were outlined in which vapor bubbles had a significant and, on the contrary, fairly weak effect on the interaction regimes of two-phase droplets.

show abstract