Simultaneous Forced Convective Heat and Mass Transfer of Hot Air Flow Across a Humid‐Packed Bed

A. Abd El Badie; Ahmed S. El‐Adl

doi:10.1002/htj.70162

journal article Jan 07, 2026

Simultaneous Forced Convective Heat and Mass Transfer of Hot Air Flow Across a Humid‐Packed Bed

A. Abd El Badie Ahmed S. El‐Adl

Heat Transfer Vol. 55 No. 3 pp. 1758-1769 · Wiley

View at Publisher Save 10.1002/htj.70162

Abstract

ABSTRACT
The design of Packed Beds (PBs) presents significant technical challenges and has prompted extensive investigation. The present study experimentally investigates simultaneous heat and mass transfer through a Humid Packed Bed (HPB). A Packing Material (PM) of equal‐sized wetted spherical beads made from commercially available non‐hygroscopic porous white brick, with ambient air serving as the Heat Transfer Fluid (HTF). The influence of inlet air temperature (30°C–60°C), inlet air velocity (1.0–5.0 m/s), and bed profundity (5–20 cm) is analyzed for the characterization of the HPB system. Dimensionless parameters, including Nusselt number (Nu), Sherwood number (Sh), Stefan number (St), and Lewis number (Le), are systematically analyzed. Results demonstrate that both Nu and Sh are significantly enhanced by increased air velocity, driven by enhanced turbulence and thinner boundary layers, but decrease with greater bed profundity owing to declining temperature and concentration gradients. Higher inlet temperature enhances Sh by accelerating vapor diffusion, while concurrently limiting Nu due to cooling effects and the influence of temperature‐dependent properties. A direct relationship was observed between St and both air velocity and temperature, but demonstrated negligible sensitivity to bed profundity. Conversely, Le revealed an inverse relationship with rising air velocity and input temperature but increments with profundity. These findings illustrate the complicated interplay between heat and mass transfer mechanisms in HPB systems and provide valuable insights for system design optimization.

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Details

Published: Jan 07, 2026
Vol/Issue: 55(3)
Pages: 1758-1769
License: View

Authors

A

A. Abd El Badie

Department of Mechanical Engineering Higher Technological Institute (H.T.I.) 10th of Ramadan City Egypt

A

Ahmed S. El‐Adl

Department of Mechanical Engineering Higher Technological Institute (H.T.I.) 10th of Ramadan City Egypt

Cite This Article

A. Abd El Badie, Ahmed S. El‐Adl (2026). Simultaneous Forced Convective Heat and Mass Transfer of Hot Air Flow Across a Humid‐Packed Bed. Heat Transfer, 55(3), 1758-1769. https://doi.org/10.1002/htj.70162

Simultaneous Forced Convective Heat and Mass Transfer of Hot Air Flow Across a Humid‐Packed Bed

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