Površinska napetost tekućina i talina

undergraduate thesis

• Title (english): Surface tension of liquids and melts
• Author: Alen Pinter
• Mentor: Anita Begić Hadžipašić (mentor)
• Committee member: Damir Hršak (predsjednik povjerenstva)
• Committee member: Anita Begić Hadžipašić (član povjerenstva)
• Committee member: Ivan Brnardić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2015-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy; Process Metallurgy

Abstract

Napetost površine nastaje zato jer je površinski sloj tekućine rjeđi od njene
unutrašnjosti. Zbog toga molekule nisu na ravnotežnim udaljenostima, nego su međusobno udaljenije, pa među njima djeluju privlačne sile s težnjom da smanje razmak molekula. Ove privlačne sile stvaraju površinsku napetost. Površinska napetost se smanjuje povećavanjem temperature, jer povećani nered potiče povratak udaljenih molekula natrag na površinu.
Budući su fizikalna svojstva poput viskoznosti, gustoće i površinske napetosti talina vrlo važna u mnogim metalurškim procesima, u ovom radu je definiran pojam površinske napetosti te njena ovisnost o temperaturi. Također je dan pregled praktičnih primjera površinske napetosti te metoda odreĎivanja površinske napetosti tekućina i talina.

Abstract (english)

Surface tension occurs because the surface layer of fluid is rarer than its interior. Therefore, molecules are not in equilibrium distances, but are more distant to each other, so between them act attractive forces with the tendency to reduce the distance between the molecules. These attractive forces create surface tension. The surface tension is reduced by increasing the
temperature, because the increasing disorder encourages the return of runaway molecules to the surface.
Since the physical properties such as viscosity, density and surface tension of melts is very important in many metallurgical processes, this paper defined the concept of surface tension and its dependence on temperature. It also gives an overview of practical examples of the surface tension and the methods of determining the surface tension of liquids and melts.

• Keywords: površinska napetost; tekućine; taline; temperatura
• Keywords (english): surface tension; liquids; melts; temperature
• Language: croatian
• URN:NBN: urn:nbn:hr:115:495112
• Study programme: Title: Undergraduate study program Metallurgy; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2015-11-13 09:36:15