Razvoj procedure mjerenja viskoznosti ulja rotacijskim viskozimetrom

undergraduate thesis

• Title (english): Development of oil viscosity measurement procedure by rotational viscometer
• Author: Ksenija Polančec
• Mentor: Davor Ljubas (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2020-02-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

U okviru ovog rada opisana je procedura mjerenja viskoznosti ulja rotacijskim viskozimetrom. Kroz rad su objašnjeni osnovni pojmovi iz područja podmazivanja strojnih elemenata mazivim uljima (viskoznost, indeks viskoznosti, stinište, plamište, hlapljivost, oksidacijska stabilnosti). Također, ukratko su opisane i druge, već razvijene procedure mjerenja viskoznosti. Na rotacijskom viskozimetru bilo je potrebno utvrditi metodologiju postizanja i održavanja određene mjerne temperature, a za to se koristilo izvedba sa strujanjem vode kroz crijevo oko mjernog uzorka. Eksperimentalni dio ovog zadatka obavljen je u Laboratoriju za vodu, gorivo i mazivo i Laboratoriju za inženjersku keramiku, oba laboratorija su u sklopu Fakulteta strojarstva i brodogradnje u Zagrebu. U laboratorijskim ispitivanjima viskoznosti korištena su tri motorna ulja različitih viskoznost koja su dostupna na našem tržištu: INA Super 5 SAE 15W-40, Shell Helix Ultra 5W-30 i Castrol Power 1 2T. Za kalibraciju uređaja korišteno je kalibracijsko loživo ulje s točno propisanim parametrima. Kalibracija i mjerenja su obavljena na 20 °C i 40 °C, a svako mjerenje je ponovljeno najmanje tri puta te su za konačne rezultate uzimane srednje vrijednosti. Za usporedbu eksperimentalnih rezultata učinjena je kalibracija i mjerenje na Höpplerovom viskozimetru te su u tim mjerenjima dobivene manje razlike u rezultatima.

Abstract (english)

This bachelor thesis describes the procedure for measuring the viscosity of an oil using a rotational viscometer. Through the paper basic properties of lubrication of machine elements have been explained (viscosity, viscosity index, pour point, flash point, volatility, oxidation stability). Also, other already developed viscosity measurement procedures are shown. On a rotational viscometer we need to determine the methodology for achieving and maintaining a certain temperature. This problem was solved with use of water flow through hose around the measuring sample. The experimental part of this assignment was performed in the Laboratory for Water, Fuel and Lubricants and in the Laboratory for Engineering Ceramics, both laboratories within the Faculty of Mechanical Engineering and Naval Architecture in Zagreb. The experimental part includes an analysis of three different engine oils which are available in our market: INA Super 5 SAE 15W-40, Shell Helix Ultra 5W-30 and Castrol Power 1 2T. Calibration fuel oil with prescribed parameters was used to calibrate the device. Calibration and measurements were performed at 20°C and 40°C. Each measurement was repeated three times and mean values were taken for final results. To compare the experimental results, calibration and measurement were performed on a Höppler viscometer. Some differences in the results were obtained in these measurements.

• Keywords: viskoznost; rotacijski viskozimetar; Höpplerov viskozimetar
• Keywords (english): viscosity; rotational viscometer; Höppler’s viscometer
• Language: croatian
• URN:NBN: urn:nbn:hr:235:621488
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2022-02-21
• Created on: 2020-02-26 07:13:09