Multiphase flow and boiling phase-change within microchannels are of paramount importance to thermal management electronics cooling, among others. The present experimental study investigated the bubble dynamics patterns during in a high aspect ratio microchannel at different channel orientations. Hydrofluoroether (HFE−7000) was used as working fluid transparent glass with width-to-height 10 hydraulic diameter 909 μm. A tantalum layer coating applied channel, allowing visual observation be...

The two-phase flow application was commonly found in industrial processes, such as oil and gas production wells, pipelines, etc. characteristic of had various aspects depending on its interfacial behaviour. structures air-water a horizontal pipe were experimentally investigated by using visualization method with high speed camera. experiments conducted facility, total length 10 m made from acrylic 26 mm ID. To obtain the pattern, 132 condition observed. superficial liquid velocities set to...

Slug flow is a part of intermittent which avoided in industrial application because its irregularity and high pressure fluctuation. Those characteristics cause some problems such as internal corrosion the damage pipeline construction. In order to understand slug characteristics, measurement techniques can be applied wire-mesh sensors, CECM, speed camera. The present study was aimed determine by using image processing techniques. Experiment has been carried out 26 mm i.d. acrylic horizontal...

The trend of miniaturisation in recent decades has led to the development compact electronic devices. reduction required dimension leads exponential rise heat flux dissipated from such a system. A proper thermal management system is necessary keep temperature computer chip’s junction within acceptable limits and maintain its performance. Flow boiling modification using straight fins microchannels proven be an effective passive enhancement cooling core interest this research figuring out...

The aim of this research is to investigate the characteristics sub regime slug flow in horizontal pipe. Here, a 16 mm inner diameter pipe utilized order observe specific behavior each pattern. air and water superficial velocity are 0.7 – 8 m/s 0.2 1.13 m/s, respectively. To obtain thorough insight through visualization, high speed video camera installed on area 190 D where fully developed. A pair CECM sensor also placed gather quantitative data from liquid hold up. Furthermore, pressure...

Slug is one of the most avoided flows in piping system network. The high pressure fluctuations can cause damage to pipes. Therefore, prevention slug flow very important. To understand phenomenon, an experimental study investigate pattern stratified transition has been examined. present work was conducted on a 26 mm diameter acrylic horizontal pipe with length 10 m. Air and water are used as working fluids. Visual image capture done using Phantom Miro M310 High speed camera L/D 180-210 from...

The use of microbubble has grown massively in many fields such as petrochemical industry and waste water treatment. This phenomenon offers some advantages since the ability to provide larger liquid-gas surface contact area. In order achieve depth understanding related those phenomena, measurement methods can be applied a capillary suction probe, conductivity probes, and, Phase Doppler Anemometry. present work was conducted determine characteristic size distribution by using digital image...

Multiple droplets are the drop of water which continuously dropped on a surface in certain time difference. The phenomenon impacting solid can be found various field, one them is cooling process metal industry. carried out by spraying number to hot until it reaches desired condition. When impinge surface, dynamics droplets, such as spreading and recoil phenomena, depend some properties. In this study, effect pressure frequency droplet characteristics well effectiveness will investigated....

The effect of material conductivity on the dynamics behavior and heat transfer phenomena multiple water droplets impacting onto heated solid surfaces has been studied experimentally. droplet diameter Weber number were 2.8 mm 46.2 respectively. test materials Stainless Steel, Aluminum, Cooper. temperatures ranged from 110°C – 140°C. during hot investigated by using a high-speed video camera. To gather quantitative information, new developed image processing technique was developed. It is able...

The co-current air-water two-phase stratified flow is desired to occur in the application of pipelines system, such as natural gas gathering, long distance pipelines, and transmission because this characteristics offers some advantages related safety factor operational condition. pressure drop considered one an important capital operation costs for simultaneous transportation liquid various industries. main objective study examine effect superficial velocities, pipes diameter on flow....

Several flow measurement methods have been developed to get more in depth information of two-phase flow.Digital image processing technique is one the which provide many advantages.It classified as non-intrusive and able process a large number images.Furthermore, this also supported by flexible algorithm advanced technology high speed camera.In slug flow, presence small bubble become biggest challenges since it can distract interface.This work explains procedures clear interface between gas...

Microchannel flow boiling is a promising thermal management solution that could facilitate enhanced device performance whilst adhering to miniature sizing constraints. The dynamics and heat transfer mechanism are influenced by the properties of chosen working fluid. Previous studies have highlighted certain dilute water-alcohol solutions inhibited positive self-rewetting attributes leading augmented two-phase mitigated occurrence dry-out.This experimental study considered six fluids...

The aim of the present experimental study is to investigate flow boiling characteristics in a high aspect ratio microchannel for two different channel orientations. Hydrofluoroether 7000 (HFE−7000) flowing within rectangular glass (with hydraulic diameter 909 μm and width-to-height 10) coated with tantalum layer provide uniform heating along was configuration investigated. data were recorded mass fluxes 14 − 42 kg m−2 s−1, while heat flux varied between 3.5 24.3 kW/m−2(-|-) under horizontal...

The use of microbubbles has grown immensely in many fields such as the petrochemical industry and wastewater treatment. This phenomenon offers a number advantages that include ability to provide larger liquid-gas surface contact areas. In addition, shallow aeration conditions horizontal injection is preferred order increase area time, thereby increasing mass transfer rate. this study, orifice type microbubble generator was set on rectangular transparent glass box support visualization. A...

The aim of this research is to reveal the dynamic behavior successive multiple 20% ethylene glycol aquades droplet impacting on hot surface. An experiment has been conducted by utilizing stainless steel as diameter and impact velocity are 2.8 1.1 m/s, respectively. Then, Weber number approximately 55. In present study, an induction heater utilized achieve desired temperature It set at 110 - 230°C. addition, image processing technique applied in order obtain essential quantitative information...