Sökning: "Friktionsfaktor"

Hittade 3 uppsatser innehållade ordet Friktionsfaktor.

  1. 1. Numerical modeling of airflow on the cathode-side of a bipolar flow plate : How the formed geometry affects the pressure drop and flow distribution in a hydrogen fuel cell

    Master-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Författare :Olivia Johansson; [2023]
    Nyckelord :Performance; Cross-sectional geometry; Computational fluid dynamics;

    Sammanfattning : Climate change and rising temperatures is a well-known problem. To tackle global warming a transition from fossil fuels to renewable and reliable energy sources is necessary. Hydrogen, in fuel cells, is proposed to replace diesel and gasoline in the transport sector. LÄS MER

  3. 2. Inledande utvärdering av epoxibaserad livstidsförlängning av fjärrvärmerör : Relining av kolstål med en polyamidhärdande lösningsmedelsfri epoxi

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för kemi - Ångström

    Författare :Jennifer Andersson; [2022]
    Nyckelord :Relining; Epoxy; District heating; Corrosion; BPA; Glass-transition temperature; Relining; Rörinfodring; Fjärrvärmesystem; Livstidsförlängning; Korrosion; Rost; Epoxi; BPA; Tvärbundna polymerer; Sorption; Diffusion; Glasomvandlingstemperatur; Joniska transportvägar; Friktionsfaktor;

    Sammanfattning : Degradation of steel pipes in district heating systems is often a result of corrosion processes. To maintain the power in the systems the pipes gets replaced when they have been worn-out, resulting in high cost and long service time due to excavation. LÄS MER

  4. 3. Precision Tailoring Cooling Systems using Linear Regression

    Kandidat-uppsats, KTH/Matematisk statistik

    Författare :Kajsa Bjelle; Ida Cui; [2021]
    Nyckelord :Regression analysis; nonlinear regression; linear regression; Levenberg-Marquardt; applied mathematics; friction factor; wavy fin; bachelor thesis; Regressionsanalys; ickelinjär regression; linjär regression; Levenberg-Marquardt; tillämpad matematik; friktionsfaktor; wavy fin; kandidatexamensarbete;

    Sammanfattning : This bachelor thesis is written for KTH Royal Institute of Technology and Ymer Technology AB. It examines the friction factor associated with the pressure drop in wavy-fin heat exchangers. Previous studies have used a nonlinear approach for determining the regression coefficients. LÄS MER