Author
Deendarlianto
Bio: Deendarlianto is an academic researcher from Gadjah Mada University. The author has contributed to research in topics: Two-phase flow & Wetting. The author has an hindex of 6, co-authored 6 publications receiving 148 citations.
Topics: Two-phase flow, Wetting, Evaporation, Wave shoaling, Surface roughness
Papers
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TL;DR: In this article, the effects of fluid properties on the wave velocity and frequency of gas-liquid annular two-phase flow were investigated in 26 and 16-mm inner pipe diameters.
52 citations
TL;DR: In this article, the transient calculations were carried out using a Volume of Fluid (VoF) multiphase flow model of the commercial CFD code of FLUENT 6.3.
47 citations
TL;DR: In this article, the circumferential film thickness distribution in an air-water horizontal annular two-phase flow was investigated in 26mm pipe diameter by using the conductance probe.
33 citations
TL;DR: In this paper, the effect of surface wettability on the collision dynamics and heat transfer phenomena of a single water droplet impacting upon a heated solid surface has been studied experimentally.
27 citations
TL;DR: In this paper, the effect of surface roughness on the dynamic behavior and the heat transfer phenomena of multiple successive micrometric water droplets impacting onto inclined heated solid surfaces has been studied experimentally.
22 citations
Cited by
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TL;DR: In this article, a gas-liquid slug two-phase flow in a horizontal pipe was carried out to investigate the initiation and flow development mechanisms, and the slug initiation mechanisms were explained by visual observation and pressure fluctuations.
68 citations
TL;DR: In this paper, numerical simulation of the plug and the slug flow regimes have been performed using the Multi-Fluid VoF and Shear Stress Transport (SST) k-ω models in a horizontal pipe with 44mm diameter.
Abstract: Numerical simulation of the plug and the slug flow regimes have been performed using the Multi-Fluid VoF and Shear Stress Transport (SST) k–ω models in a horizontal pipe with 44 mm diameter. The superficial velocities during the current study were set at 0.16, 1.64 & 3 m/s for the gas phase and 1 m/s for the liquid one. The pressure and the velocity equations were solved together, utilizing the PIMPLE algorithm in all cases of the present study. The VoF model, as well as the experimental outcomes, were applied to assess the results of Multi-Fluid VoF model. The qualitative comparison of numerical results with the experimental visualization revealed that the Multi-Fluid VoF model simulates precisely the interfacial structure of slug and plug flows, as well as the chronological formation of the slug. The length ratio of the gas slug to the liquid slug goes up with the gas superficial velocity increment; this issue increases the probability at low liquid hold-ups and decreases the higher ones. The Multi-Fluid VoF provided much more matching with the mentioned probability changes in comparison to the VoF model. The pressure drop calculated using Multi-Fluid VoF in the Lockhart–Martinelli framework illustrated a 21.8% improvement averagely in comparison to the VoF model. The obtained transitional slug velocities showed that the Multi-Fluid VoF model presented a maximum error of 8.17% versus the experimental values, while the mentioned error for the VoF model was estimated at 22.01%. Notwithstanding the mentioned advantages, the Multi-Fluid VoF model significantly increased, both the execution time of simulation as well as the associated costs.
49 citations
TL;DR: In this article, the authors present a review of multiple droplet impingement heat transfer, and the effects of the characteristics of different surfaces on spray cooling performance, showing that enhanced surfaces can boost the outcome of spray cooling in different ways that depend on the temperature of the surface relative to the saturation temperature of liquid and the spray inclination.
46 citations
TL;DR: In this article, a single laser sheet is used to excite the liquid film, which has been seeded with a fluorescent dye, along a longitudinal/vertical plane normal to the pipe wall, and two cameras are placed at different angles to the plane of the laser sheet in order to recover, independently by the two techniques, the shape of the gas-liquid interface along this section.
41 citations
TL;DR: The two conclusions for practical applications for weakly evaporating conditions are that the higher the ECA, the smaller is the effect of the surface temperature, and a good evaluation of the decrease of the E CA with the surfaceTemperature can be obtained by the proposed DTM approach.
Abstract: The measurement of the equilibrium contact angle (ECA) of a weakly evaporating sessile drop becomes very challenging when the temperatures are higher than ambient temperature. Since the ECA is a critical input parameter for numerical simulations of diabatic processes, it is relevant to know the variation of the ECA with the fluid and wall temperatures. Several research groups have studied the effect of temperature on ECA either experimentally, with direct measures, or numerically, using molecular dynamic simulations. However, there is some disagreement between the authors. In this paper two possible theoretical models are presented, describing how the ECA varies with the surface temperature. These two models (called Decreasing Trend Model and Unsymmetrical Trend Model, respectively) are compared with experimental measurements. Within the experimental errors, the equilibrium contact angle shows a decrease with increasing surface temperatures on the hydrophilic surface. Conversely the ECA appears approximately constant on hydrophobic surfaces for increasing wall temperatures. The two conclusions for practical applications for weakly evaporating conditions are that (i) the higher the ECA, the smaller is the effect of the surface temperature, (ii) a good evaluation of the decrease of the ECA with the surface temperature can be obtained by the proposed DTM approach.
38 citations