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All Journal Jurnal Teknik ITS IPTEK The Journal of Engineering IPTEK Journal of Proceedings Series JMES The International Journal of Mechanical Engineering and Sciences
Budi Utomo Kukuh Widodo
Department Of Mechanical Engineering, Institut Teknologi Sepuluh Nopember
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Characterization of Natural Convection over an Elliptical Tubes Array AR 2.5 and PR 1.25 inside a Thermally Asymmetric Cavity of Various Clearance Ratio Stefanus Widhipratama; Budi Utomo Kukuh Widodo
JMES The International Journal of Mechanical Engineering and Sciences Vol 2, No 1 (2018)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v2i1.5167

Abstract

Natural convection is the phenomenon of heat transfer due to the buoyancy force of fluid. One application of natural convection inside a vertical cavity is refrigerator condenser of circular cross-section tube. An experimental investigation is presented on natural convection of air over an array of elliptical tubes of AR 2.5 arranged vertically inside a thermally asymmetric cavity. One side of the cavity is insulated and the opposite side is exposed to ambient air. The distance between tubes, pitch ratio PR is constant at 1.25 where “a” is a half of tube major axis. The Clearance Ratio \textit{CR} which is the ratio between the distance of tubes array major axis to the insulated wall x and the width of the cavity y, is varied 0.4 and 0.6. The heat flux of the tube is maintained at 22.79 kW/m$^2$. It is found that the higher value of heat transfer coefficient is achieved on CR= 0.4.
Experimental and Numerical Studies of Natural Convection on Elliptical Tube in Thermal Asymmetric Cavity Angga Tegar Setiawan; Budi Utomo Kukuh Widodo; Nila Rahmawati
JMES The International Journal of Mechanical Engineering and Sciences Vol 2, No 2 (2018)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v2i2.6398

Abstract

The characteristic of natural convection heat transfer in a thermally asymmetric cavity is influenced by temperature differences and space between the heat source and cavity wall. The heat source is any bluff body placed inside the cavity. This research used a heated elliptic tube as the heat source inside the cavity. The three tubes are of 2.5 aspect ratio (AR) in a vertically aligned arrangement. The cavity was thermally asymmetric because three sides of the cavity were insulated while the other side was exposed to convection with ambient air. The clearance ratio (CR) as the ratio between the gap from the insulated wall to the major axis of the tubes to the space of the cavity is varied 0.4 and 0.6. while the pitch ratio is constant at 3.5a. this study analyzes the characteristics of heat transfer from the surface of the elliptical tube to the surrounding air experimentally and numerically. The result reveals that the highest heat transfer coefficient 0f 0.4 CR is higher than that of 0.6 CR. The numerical solution shows the contour and streamlines of the fluid flow in all conditions as the characteristics of natural transfer thermally asymmetric cavity.
Thermal Analysis on Water-Simple Rankine Cycle and Combined Cycle for Waste Heat Recovery Flat Glass Factory Zefanya Hiro Wibowo; Budi Utomo Kukuh Widodo; Djatmiko Ichsani
JMES The International Journal of Mechanical Engineering and Sciences Vol 1, No 1 (2017)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v1i1.2213

Abstract

One of the most important processes in glass production is the furnace section. The furnace’s waste heat, which still has a temperature around 400oC-500°C, is often released directly to the surrounding using a stack. Waste Heat Recovery Generation (WHRPG) and Organic Rankine Cycle (ORC) is one of the many waste heat reusing schemes implemented to increase the efficiency of industrial processes by converting the waste heat into electricity. Two schemes of the system will be studied in this research; there are Water-Simple Rankine Cycle (WSRC) and combined cycle (WSRC and ORC). In the WSRC, steam mass flow rate varied and found the highest performance to compare with combined cycle system. For combined cycle, the variations of the system are steam mass flow rate, the evaporating temperature, flue gas temperature in stack and refrigerant as working fluid. For the result, the highest combined cycle perform is 5.89 MW with steam mass flow rate 5 kg/s. Higher evaporating temperature (160°C) results in a higher combined cycle performance (5.96 MW), while, similarly, a lower flue gas temperature (120°C) also yields a higher combined cycle performance (6.3 MW). By varying the working fluids of R-11, R-113, and R-114.
Co-Authors Adi Apriyanto Wijaya Alik Dinikavanila Amalia Dwi Utami Ananda Azaria Febriana Angga Tegar Setiawan Ary Bachtiar Krisna Putra Bambang Sudarmanta Canny Cado Dwi Putri Ayu Djatmiko Ichsani Frans Loekito Is Bunyamin Suryo Linda Wijiati Maria Ulfa Damayanti Muchlisin Muchlisin Nazilah Nazilah Nila Rahmawati Prabowo Prabowo Stefanus Widhipratama Zefanya Hiro Wibowo