---
_id: '7258'
abstract:
- lang: eng
  text: Many flows encountered in nature and applications are characterized by a chaotic
    motion known as turbulence. Turbulent flows generate intense friction with pipe
    walls and are responsible for considerable amounts of energy losses at world scale.
    The nature of turbulent friction and techniques aimed at reducing it have been
    subject of extensive research over the last century, but no definite answer has
    been found yet. In this thesis we show that in pipes at moderate turbulent Reynolds
    numbers friction is better described by the power law first introduced by Blasius
    and not by the Prandtl–von Kármán formula. At higher Reynolds numbers, large scale
    motions gradually become more important in the flow and can be related to the
    change in scaling of friction. Next, we present a series of new techniques that
    can relaminarize turbulence by suppressing a key mechanism that regenerates it
    at walls, the lift–up effect. In addition, we investigate the process of turbulence
    decay in several experiments and discuss the drag reduction potential. Finally,
    we examine the behavior of friction under pulsating conditions inspired by the
    human heart cycle and we show that under such circumstances turbulent friction
    can be reduced to produce energy savings.
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Davide
  full_name: Scarselli, Davide
  id: 40315C30-F248-11E8-B48F-1D18A9856A87
  last_name: Scarselli
  orcid: 0000-0001-5227-4271
citation:
  ama: Scarselli D. New approaches to reduce friction in turbulent pipe flow. 2020.
    doi:<a href="https://doi.org/10.15479/AT:ISTA:7258">10.15479/AT:ISTA:7258</a>
  apa: Scarselli, D. (2020). <i>New approaches to reduce friction in turbulent pipe
    flow</i>. Institute of Science and Technology Austria. <a href="https://doi.org/10.15479/AT:ISTA:7258">https://doi.org/10.15479/AT:ISTA:7258</a>
  chicago: Scarselli, Davide. “New Approaches to Reduce Friction in Turbulent Pipe
    Flow.” Institute of Science and Technology Austria, 2020. <a href="https://doi.org/10.15479/AT:ISTA:7258">https://doi.org/10.15479/AT:ISTA:7258</a>.
  ieee: D. Scarselli, “New approaches to reduce friction in turbulent pipe flow,”
    Institute of Science and Technology Austria, 2020.
  ista: Scarselli D. 2020. New approaches to reduce friction in turbulent pipe flow.
    Institute of Science and Technology Austria.
  mla: Scarselli, Davide. <i>New Approaches to Reduce Friction in Turbulent Pipe Flow</i>.
    Institute of Science and Technology Austria, 2020, doi:<a href="https://doi.org/10.15479/AT:ISTA:7258">10.15479/AT:ISTA:7258</a>.
  short: D. Scarselli, New Approaches to Reduce Friction in Turbulent Pipe Flow, Institute
    of Science and Technology Austria, 2020.
date_created: 2020-01-12T16:07:26Z
date_published: 2020-01-13T00:00:00Z
date_updated: 2023-09-15T12:20:08Z
day: '13'
ddc:
- '532'
degree_awarded: PhD
department:
- _id: BjHo
doi: 10.15479/AT:ISTA:7258
ec_funded: 1
file:
- access_level: closed
  checksum: 4df1ab24e9896635106adde5a54615bf
  content_type: application/zip
  creator: dscarsel
  date_created: 2020-01-12T15:57:14Z
  date_updated: 2021-01-13T23:30:05Z
  embargo_to: open_access
  file_id: '7259'
  file_name: 2020_Scarselli_Thesis.zip
  file_size: 26640830
  relation: source_file
- access_level: open_access
  checksum: 48659ab98e3414293c7a721385c2fd1c
  content_type: application/pdf
  creator: dscarsel
  date_created: 2020-01-12T15:56:14Z
  date_updated: 2021-01-13T23:30:05Z
  embargo: 2021-01-12
  file_id: '7260'
  file_name: 2020_Scarselli_Thesis.pdf
  file_size: 8515844
  relation: main_file
file_date_updated: 2021-01-13T23:30:05Z
has_accepted_license: '1'
language:
- iso: eng
month: '01'
oa: 1
oa_version: None
page: '174'
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '306589'
  name: Decoding the complexity of turbulence at its origin
- _id: 25104D44-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '737549'
  name: Eliminating turbulence in oil pipelines
- _id: 25136C54-B435-11E9-9278-68D0E5697425
  grant_number: HO 4393/1-2
  name: Experimental studies of the turbulence transition and transport processes
    in turbulent Taylor-Couette currents
publication_identifier:
  issn:
  - 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
  record:
  - id: '6228'
    relation: part_of_dissertation
    status: public
  - id: '6486'
    relation: part_of_dissertation
    status: public
  - id: '461'
    relation: part_of_dissertation
    status: public
  - id: '422'
    relation: part_of_dissertation
    status: public
status: public
supervisor:
- first_name: Björn
  full_name: Hof, Björn
  id: 3A374330-F248-11E8-B48F-1D18A9856A87
  last_name: Hof
  orcid: 0000-0003-2057-2754
title: New approaches to reduce friction in turbulent pipe flow
type: dissertation
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
year: '2020'
...