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@article{207551,
        author = {Asrar Isa Shaha and Dr. Subhash Lahane},
        title = {A Review of Thermo-Hydraulic Performance in Rib-Roughened Solar Air Heater Ducts: Inclined and Modified V-Shaped Ribs on a Single Heated Wall of a Square Channel},
        journal = {International Journal of Innovative Research in Technology},
        year = {2026},
        volume = {13},
        number = {3},
        pages = {1567-1577},
        issn = {2349-6002},
        url = {https://ijirt.org/article?manuscript=207551},
        abstract = {A solar air heater is a simple idea that is hard to execute well. Sunlight falls on a blackened absorber plate, and a stream of air moving behind it is supposed to carry that heat away. In practice the plate and the air barely interact: a thin, slow-moving layer of air clings to the plate and blocks much of the heat transfer the collector is built to deliver. Roughening the underside of the absorber plate with small ribs is the standard fix, and it has occupied researchers for more than three decades. This paper reviews that literature, concentrating on transverse, inclined (30–90°), V-shaped and modified V-shaped rib geometries applied to a single heated wall of a square or rectangular duct. It traces the field from the equal-pumping-power theory of Webb and Eckert and the early rib-turbulator work of Han and coworkers, through the solar air heater roughness correlations that Prasad, Saini and their collaborators built up over the following decades. Reported Nusselt number gains typically run from about 1.5 to just over 3 times the smooth duct value, and the friction factor usually rises by a comparable or larger amount, which is why a thermo-hydraulic performance parameter, not Nusselt number alone, ultimately determines which geometry is worth building.},
        keywords = {Solar air heater, rib roughness, V-shaped ribs, thermo-hydraulic performance, square channel, Nusselt number, friction factor.},
        month = {August},
        }