Tag: NTIW

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  • TT-28 Specifying disk-and-doughnut baffles in <em><strong>X</strong>ist</em>

    TT-28 Specifying disk-and-doughnut baffles in Xist

    December 04, 2019
    Component: Xist Applicable to: All supported versions (Versions 8.2 and 9) Date posted: 5 December 2019 (updated 26 October 2023) Disk-and-doughnut baffles are an alternative to conventional segmental baffles. Figure 1 illustrates a generic disk-and-doughnut baffle configuration. In many industrial units, tubes are present only in the overlap region between the...
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  • TT-18 Design guidance for no-tube-in-window (NTIW) baffles

    TT-18 Design guidance for no-tube-in-window (NTIW) baffles

    January 26, 2017
    Component: Xist Applicable to: All supported versions (Versions 7.3 and 8) Date posted: 25 March 2015 Compared to other segmental baffle designs, no-tube-in-window (NTIW) baffles provide improved tube support with low pressure drop. Adding intermediate support plates between baffles can alleviate tube vibration for virtually any baffle spacing, thus simplifying low...
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  • S-SS-3-25 Analysis of NTIW shellside performance using CFD and Xist

    S-SS-3-25 Analysis of NTIW shellside performance using CFD and Xist

    January 16, 2017
    Using computational fluid dynamics (CFD) and Xist, HTRI simulated three configurations of no-tubes-in-window (NTIW) bundles in shell-and-tube heat exchangers. Our analysis of the trends in pressure drop and heat transfer underscores the importance of window friction and window momentum losses, even without tubes in this region, as well as the existence...
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  • Research Update: Analysis of NTIW Shellside Performance using CFD and Xist

    Research Update: Analysis of NTIW Shellside Performance using CFD and Xist

    January 16, 2017
    This webinar will discuss Xist® and CFD predictions of three NTIW exchanger configurations – 2 baffle, 4 baffles, and 6 baffles. The discussion will focus on the contributions of crossflow and longitudinal flow on heat transfer, which is due to varied baffle spacing for the same baffle cut. During the webinar,...
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  • S-SS-3-14 CFD Study of NTIW Bundles

    S-SS-3-14 CFD Study of NTIW Bundles

    January 16, 2017
    The thermal hydraulic performance of a gas-gas no-tubes-in-window (NTIW) field exchanger was studied parametrically using computational fluid dynamics (CFD). The tubes were modeled using porous media with velocity-dependent volumetric heat generation. An important performance indicator among the design variants was the ratio of the window velocity to the crossflow velocity. When...
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