---
OA_type: closed access
_id: '20928'
abstract:
- lang: eng
  text: The current work focuses on the performance of hydrodynamics and mass transfer
    in a microchannel. A hydrodynamic model is developed for a gas–liquid (CO2–water)
    system and slug flow pattern. For the first time in literature, a concept of pulsating
    velocity input is introduced in an enhanced cross-T-junction microchannel to study
    the mass transfer using the physical absorption mechanism in ANSYS FLUENT R2 2024.
    The mass transfer model is associated with the hydrodynamic model and some user-defined
    functions in FLUENT. This work demonstrates that incorporating obstructions and
    applying trapezoidal and sinusoidal wave inputs improve the CO2 absorption rate.
    The obtained data are further compared with the plain T-junction microchannel
    in terms of mass transfer coefficient. Solubility of CO2 in three different solvents
    (ethyl alcohol, water, and ethylene glycol) has been revealed in an enhanced cross
    T-junction microchannel at two different temperatures, i.e., 298.15 and 303.15 K.
    The numerical simulations illustrate that an increase in temperature has an adverse
    effect on the mass transfer rate.
acknowledgement: The authors are thankful for the financial support provided by the
  Ministry of Education, India, and MNNIT Allahabad, as well as for the necessary
  equipment, computing facilities, and overall support to carry out this study.
article_number: '122012'
article_processing_charge: No
article_type: original
author:
- first_name: Bushra
  full_name: Khatoon, Bushra
  last_name: Khatoon
- first_name: Vikas K.
  full_name: Chaudhary, Vikas K.
  last_name: Chaudhary
- first_name: Shoaib
  full_name: Kamil, Shoaib
  id: 185a19af-dc7d-11ea-9b2f-8eb2201959e9
  last_name: Kamil
- first_name: Shabih Ul
  full_name: Hasan, Shabih Ul
  last_name: Hasan
- first_name: M. Siraj
  full_name: Alam, M. Siraj
  last_name: Alam
citation:
  ama: 'Khatoon B, Chaudhary VK, Kamil S, Hasan SU, Alam MS. Enhanced mass transfer
    in microgeometry using pulsating velocity inputs: Hydrodynamic analysis and numerical
    simulation. <i>Physics of Fluids</i>. 2025;37(12). doi:<a href="https://doi.org/10.1063/5.0303132">10.1063/5.0303132</a>'
  apa: 'Khatoon, B., Chaudhary, V. K., Kamil, S., Hasan, S. U., &#38; Alam, M. S.
    (2025). Enhanced mass transfer in microgeometry using pulsating velocity inputs:
    Hydrodynamic analysis and numerical simulation. <i>Physics of Fluids</i>. AIP
    Publishing. <a href="https://doi.org/10.1063/5.0303132">https://doi.org/10.1063/5.0303132</a>'
  chicago: 'Khatoon, Bushra, Vikas K. Chaudhary, Shoaib Kamil, Shabih Ul Hasan, and
    M. Siraj Alam. “Enhanced Mass Transfer in Microgeometry Using Pulsating Velocity
    Inputs: Hydrodynamic Analysis and Numerical Simulation.” <i>Physics of Fluids</i>.
    AIP Publishing, 2025. <a href="https://doi.org/10.1063/5.0303132">https://doi.org/10.1063/5.0303132</a>.'
  ieee: 'B. Khatoon, V. K. Chaudhary, S. Kamil, S. U. Hasan, and M. S. Alam, “Enhanced
    mass transfer in microgeometry using pulsating velocity inputs: Hydrodynamic analysis
    and numerical simulation,” <i>Physics of Fluids</i>, vol. 37, no. 12. AIP Publishing,
    2025.'
  ista: 'Khatoon B, Chaudhary VK, Kamil S, Hasan SU, Alam MS. 2025. Enhanced mass
    transfer in microgeometry using pulsating velocity inputs: Hydrodynamic analysis
    and numerical simulation. Physics of Fluids. 37(12), 122012.'
  mla: 'Khatoon, Bushra, et al. “Enhanced Mass Transfer in Microgeometry Using Pulsating
    Velocity Inputs: Hydrodynamic Analysis and Numerical Simulation.” <i>Physics of
    Fluids</i>, vol. 37, no. 12, 122012, AIP Publishing, 2025, doi:<a href="https://doi.org/10.1063/5.0303132">10.1063/5.0303132</a>.'
  short: B. Khatoon, V.K. Chaudhary, S. Kamil, S.U. Hasan, M.S. Alam, Physics of Fluids
    37 (2025).
date_created: 2026-01-04T23:01:34Z
date_published: 2025-12-01T00:00:00Z
date_updated: 2026-01-05T10:54:15Z
day: '01'
department:
- _id: BjHo
doi: 10.1063/5.0303132
fulldoi: https://doi.org/10.1063/5.0303132
intvolume: '        37'
issue: '12'
language:
- iso: eng
month: '12'
oa_version: None
publication: Physics of Fluids
publication_identifier:
  eissn:
  - 1089-7666
  issn:
  - 1070-6631
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Enhanced mass transfer in microgeometry using pulsating velocity inputs: Hydrodynamic
  analysis and numerical simulation'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 37
year: '2025'
...
---
_id: '12172'
abstract:
- lang: eng
  text: In industrial reactors and equipment, non-ideality is quite a common phenomenon
    rather than an exception. These deviations from ideality impact the process's
    overall efficiency and the effectiveness of the equipment. To recognize the associated
    non-ideality, one needs to have enough understanding of the formulation of the
    equations and in-depth knowledge of the residence time distribution (RTD) data
    of real reactors. In the current work, step input and pulse input were used to
    create RTD data for Cascade continuous stirred tank reactors (CSTRs). For the
    aforementioned configuration, experiments were run at various flow rates to validate
    the developed characteristic equations. To produce RTD data, distilled water was
    utilized as the flowing fluid, and NaOH was the tracer substance. The ideal behavior
    of tracer concentration exits age distribution, and cumulative fraction for each
    setup and each input was plotted and experimental results were compared with perfect
    behavior. Deviation of concentration exit age distribution and cumulative fractional
    distribution from ideal behavior is more in pulse input as compared to a step
    input. For ideal cases, the exit age distribution curve and cumulative fraction
    curves are independent of the type of input. But a significant difference was
    observed for the two cases, which may be due to non-measurable fluctuations in
    volumetric flow rate, non-achievement of instant injection of tracer in case of
    pulse input, and slight variations in the sampling period. Further, with increasing
    flow rate, concentration, exit age, and cumulative fractional curves shifted upward,
    and this behavior matches with the actual case.
article_processing_charge: No
article_type: original
author:
- first_name: Bushra
  full_name: Khatoon, Bushra
  last_name: Khatoon
- first_name: Shoaib
  full_name: Kamil, Shoaib
  id: 185a19af-dc7d-11ea-9b2f-8eb2201959e9
  last_name: Kamil
- first_name: Hitesh
  full_name: Babu, Hitesh
  last_name: Babu
- first_name: M.
  full_name: Siraj Alam, M.
  last_name: Siraj Alam
citation:
  ama: 'Khatoon B, Kamil S, Babu H, Siraj Alam M. Experimental analysis of Cascade
    CSTRs with step and pulse inputs. <i>Materials Today: Proceedings</i>. 2023;78(Part
    1):40-47. doi:<a href="https://doi.org/10.1016/j.matpr.2022.11.037">10.1016/j.matpr.2022.11.037</a>'
  apa: 'Khatoon, B., Kamil, S., Babu, H., &#38; Siraj Alam, M. (2023). Experimental
    analysis of Cascade CSTRs with step and pulse inputs. <i>Materials Today: Proceedings</i>.
    Elsevier. <a href="https://doi.org/10.1016/j.matpr.2022.11.037">https://doi.org/10.1016/j.matpr.2022.11.037</a>'
  chicago: 'Khatoon, Bushra, Shoaib Kamil, Hitesh Babu, and M. Siraj Alam. “Experimental
    Analysis of Cascade CSTRs with Step and Pulse Inputs.” <i>Materials Today: Proceedings</i>.
    Elsevier, 2023. <a href="https://doi.org/10.1016/j.matpr.2022.11.037">https://doi.org/10.1016/j.matpr.2022.11.037</a>.'
  ieee: 'B. Khatoon, S. Kamil, H. Babu, and M. Siraj Alam, “Experimental analysis
    of Cascade CSTRs with step and pulse inputs,” <i>Materials Today: Proceedings</i>,
    vol. 78, no. Part 1. Elsevier, pp. 40–47, 2023.'
  ista: 'Khatoon B, Kamil S, Babu H, Siraj Alam M. 2023. Experimental analysis of
    Cascade CSTRs with step and pulse inputs. Materials Today: Proceedings. 78(Part
    1), 40–47.'
  mla: 'Khatoon, Bushra, et al. “Experimental Analysis of Cascade CSTRs with Step
    and Pulse Inputs.” <i>Materials Today: Proceedings</i>, vol. 78, no. Part 1, Elsevier,
    2023, pp. 40–47, doi:<a href="https://doi.org/10.1016/j.matpr.2022.11.037">10.1016/j.matpr.2022.11.037</a>.'
  short: 'B. Khatoon, S. Kamil, H. Babu, M. Siraj Alam, Materials Today: Proceedings
    78 (2023) 40–47.'
date_created: 2023-01-12T12:11:26Z
date_published: 2023-03-20T00:00:00Z
date_updated: 2023-08-16T09:08:11Z
day: '20'
department:
- _id: BjHo
doi: 10.1016/j.matpr.2022.11.037
fulldoi: https://doi.org/10.1016/j.matpr.2022.11.037
intvolume: '        78'
issue: Part 1
keyword:
- General Medicine
language:
- iso: eng
month: '03'
oa_version: None
page: 40-47
publication: 'Materials Today: Proceedings'
publication_identifier:
  issn:
  - 2214-7853
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: Experimental analysis of Cascade CSTRs with step and pulse inputs
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 78
year: '2023'
...