Abstract In this study, a novel smart surface-morphing technique is devised that dynamically optimises roughness parameter on sphere with varying flow conditions to minimise drag. A comprehensive series of experiments are first performed systematically study the effect dimple depth ratios in range 0 ≤ k / d 2 × 10 −2 across Reynolds number 6 4 Re 1.3 5 . It observed significantly affects both onset drag crisis and minimum achievable For constant , monotonically reduces as increases. However,...

This study investigates a novel phenomenon of lift generation around sphere by pneumatically manipulating its surface topology with an asymmetric roughness distribution. A comprehensive series systematic experiments were conducted for Reynolds numbers (Re=U∞d/ν, where U∞ is the free-stream velocity, d diameter, and ν fluid kinematic viscosity) ranging from 6×104 to 1.3×105, dimple depth ratios (k/d, k depth) 0 1×10−2 using smart morphable sphere. The findings show that asymmetrically rough...

One way to overcome the scarcity of clean water through sustainable approach is by utilizing a solar distillation system. This easy-to-use technology adopting tubular distillation. The three main components, which are most essential for producing amount permeate, collector, and heat exchanger (HE). study aims determine performance device equipped with HE using parabolic trough collector (PTC). PTC has an area 5.1 m2 covered reflective chrome film. Aluminum acts as feedwater heater. placed...

The use of personal protective equipment during the Covid-19 pandemic may inhibit social interaction and learning process children. A child respirator that is suitable for children's growth development has been developed. Its designing was done by computer-aided design validated computational fluid dynamics simulation. device consists inhale exhale system, face cover, headband. Various air filter embedded in such as prefilter, HEPA filter, bamboo-based activated carbon filter. Meanwhile,...

Waste material flowing in rivers creates several problems various aspects, especially environmental aspects. One of the waste-capturing mechanisms which is widely applied trash rack. However, studies show that racks have potential to block river flow increases risk flooding. This study proposes a screw conveyor-based waste capturing mechanism with modification blade’s design resembling rack and integrated monitoring system using internet things. The research was conducted through three...

Dimples on a sphere's surface can lead to significant drag reduction. However, the optimal dimple depth minimize varies with Reynolds number ($Re$). In this study, smart surface-morphing technique is devised that adjust based flow conditions across wide range of $Re$ values. By depressurizing core rigid skeleton enclosed thin latex membrane, be precisely controlled in response velocity changes. A comprehensive series systematic experiments are performed for $6\times10^4 \leq Re...

This study investigates a novel phenomenon of lift generation around sphere by pneumatically manipulating its surface topology with an asymmetric roughness distribution. A comprehensive series systematic experiments were conducted for Reynolds numbers ($Re = U_{\infty} d/\nu$, where $U_{\infty}$ is the fluid velocity, $d$ diameter, and $\nu$ kinematic viscosity) ranging from $6\times10^4$ to $1.3\times10^5$, dimple depth ratios ($k/d$, $k$ depth) $0$ $1\times10^{-2}$ using smart morphable...

FASSIP-01 rectangular loop is a facility which owned by PTKRN-BATAN that used for observe the phenomenon of natural circulation in large-scale. This will be applied as passive cooling system nuclear power plant built up Indonesia. Some experiments have done before, but those show fluid flow not optimal conditions because there are some errors happened and causes losses. The second modification has purpose to minimize losses previous FASSIP-01. this research know characteristics trend data...

This paper proposes a respirator for children integrated with bamboo-based activated carbon filters and bipolar ionization as the sterilizer to increase protection from Covid-19 other pathogens. The respirator, named Bion-Kids, was designed based on children's head-and-face anthropometry direct measurement. duration of sterilization process is controlled activities, which are classified using Recurrent Neural Network (RNN) model dataset acquired accelerometer. Manufacturing main body...

SMART (System-Integrated Advanced Modular Reactor) merupakan desain reaktor multifungsi Generasi III+ tipe SMR (Small yang dikembangkan oleh KAERI (Korean Atomic Energy Research Institute) dengan kapabilitas produksi listrik 107 MWe dan energi termal 365 MWt. Sistem meliputi berbagai fitur keselamatan untuk mengatasi LOCA (Loss of Coolant Accident) skenario kecelakaan lainnya. Salah satu dari tersebut adalah Passive Residual Heat Removal System (PRHRS) atau sistem pembuang sisa panas pasif...