A STUDY OF ROTARY ENGINE USING THIN LAYER OF SOAP

• Main Author: ACHDIAT (NIM : 90213001), BAMBANG
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21383
• Institution: Institut Teknologi Bandung

A rotary engine was used a liquid soap XXX and average it’s endurance until burst was 2,49 minute. Framework was used made from plastic and have mass 8,9 . 10-4 kg with it’s area 2,25 . 10-4 m2. Teoritically derivation equation state thin layer of soap is analog with ideal gas, it was looked from it’s Carnot cycle which construct by 4 process, that are 2 isotermic and two adiabatic which intersect each other make a reversible system. To avoid friction, the framework of soap thin layer was hange on a yarn which have length 93 cm and only 1 cm from lamp which have power 0,75 Watt. Before system get heat it was relative steady because the total force on the surface of soap thin layer is zero when the temperature was same in all surface area. Then, heat (Q) was accepted by system on one part of the surface. It’s surface tension (γ) was changed, so that the surface tension near the lamp became different with other part and change the distribution mass of thin layer of soap. Finally the total force on the surface is not zero and make torque (𝞽), so the system have a mechanic work (W). Efficiency mechanically was got by compare mechanic work (W) in this case rotation kinetic energy (Ekrot) with heat (Q) from the lamp. Efficiency thermodynamically was got by compare thermodynamic work (W=A.Δγ) with heat (Q) from the lamp.. The average efficiency mechanically was 2,32 .10-9 %. The average efficiency thermodynamically was 2,3 . 10-5%