---
_id: '6486'
abstract:
- lang: eng
  text: Based on a novel control scheme, where a steady modification of the streamwise
    velocity profile leads to complete relaminarization of initially fully turbulent
    pipe flow, we investigate the applicability and usefulness of custom-shaped honeycombs
    for such control. The custom-shaped honeycombs are used as stationary flow management
    devices which generate specific modifications of the streamwise velocity profile.
    Stereoscopic particle image velocimetry and pressure drop measurements are used
    to investigate and capture the development of the relaminarizing flow downstream
    these devices. We compare the performance of straight (constant length across
    the radius of the pipe) honeycombs with custom-shaped ones (variable length across
    the radius) and try to determine the optimal shape for maximal relaminarization
    at minimal pressure loss. The optimally modified streamwise velocity profile is
    found to be M-shaped, and the maximum attainable Reynolds number for total relaminarization
    is found to be of the order of 10,000. Consequently, the respective reduction
    in skin friction downstream of the device is almost by a factor of 5. The break-even
    point, where the additional pressure drop caused by the device is balanced by
    the savings due to relaminarization and a net gain is obtained, corresponds to
    a downstream stretch of distances as low as approximately 100 pipe diameters of
    laminar flow.
acknowledged_ssus:
- _id: M-Shop
article_number: '111105'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jakob
  full_name: Kühnen, Jakob
  id: 3A47AE32-F248-11E8-B48F-1D18A9856A87
  last_name: Kühnen
  orcid: 0000-0003-4312-0179
- first_name: Davide
  full_name: Scarselli, Davide
  id: 40315C30-F248-11E8-B48F-1D18A9856A87
  last_name: Scarselli
  orcid: 0000-0001-5227-4271
- first_name: Björn
  full_name: Hof, Björn
  id: 3A374330-F248-11E8-B48F-1D18A9856A87
  last_name: Hof
  orcid: 0000-0003-2057-2754
citation:
  ama: Kühnen J, Scarselli D, Hof B. Relaminarization of pipe flow by means of 3D-printed
    shaped honeycombs. <i>Journal of Fluids Engineering</i>. 2019;141(11). doi:<a
    href="https://doi.org/10.1115/1.4043494">10.1115/1.4043494</a>
  apa: Kühnen, J., Scarselli, D., &#38; Hof, B. (2019). Relaminarization of pipe flow
    by means of 3D-printed shaped honeycombs. <i>Journal of Fluids Engineering</i>.
    ASME. <a href="https://doi.org/10.1115/1.4043494">https://doi.org/10.1115/1.4043494</a>
  chicago: Kühnen, Jakob, Davide Scarselli, and Björn Hof. “Relaminarization of Pipe
    Flow by Means of 3D-Printed Shaped Honeycombs.” <i>Journal of Fluids Engineering</i>.
    ASME, 2019. <a href="https://doi.org/10.1115/1.4043494">https://doi.org/10.1115/1.4043494</a>.
  ieee: J. Kühnen, D. Scarselli, and B. Hof, “Relaminarization of pipe flow by means
    of 3D-printed shaped honeycombs,” <i>Journal of Fluids Engineering</i>, vol. 141,
    no. 11. ASME, 2019.
  ista: Kühnen J, Scarselli D, Hof B. 2019. Relaminarization of pipe flow by means
    of 3D-printed shaped honeycombs. Journal of Fluids Engineering. 141(11), 111105.
  mla: Kühnen, Jakob, et al. “Relaminarization of Pipe Flow by Means of 3D-Printed
    Shaped Honeycombs.” <i>Journal of Fluids Engineering</i>, vol. 141, no. 11, 111105,
    ASME, 2019, doi:<a href="https://doi.org/10.1115/1.4043494">10.1115/1.4043494</a>.
  short: J. Kühnen, D. Scarselli, B. Hof, Journal of Fluids Engineering 141 (2019).
date_created: 2019-05-26T21:59:13Z
date_published: 2019-11-01T00:00:00Z
date_updated: 2026-04-21T22:30:43Z
day: '01'
department:
- _id: BjHo
doi: 10.1115/1.4043494
ec_funded: 1
external_id:
  arxiv:
  - '1809.07625'
  isi:
  - '000487748600005'
intvolume: '       141'
isi: 1
issue: '11'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1809.07625
month: '11'
oa: 1
oa_version: Preprint
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '306589'
  name: Decoding the complexity of turbulence at its origin
publication: Journal of Fluids Engineering
publication_identifier:
  eissn:
  - 1528-901X
  issn:
  - 0098-2202
publication_status: published
publisher: ASME
quality_controlled: '1'
related_material:
  record:
  - id: '7258'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: Relaminarization of pipe flow by means of 3D-printed shaped honeycombs
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 141
year: '2019'
...