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The work reports on the experimental research on the determination of the number of Nusselt concerning the compact bundle of small diameter smooth tubes. Having an inline arrangement, it lacks the gapsbetween adjacent tubes of longitudinal rows. In comparison to the traditional inline arrangement, this type of bundle is noticed to have significant advantages such as an increased coefficient of heat transfer and reduced aerodynamic resistance of the tube bundle. At the same time, the use of the compact bundle of small diameter smooth tubes leads to the beneficial reduction of the size and mass of heat exchangers of the shell–and–tubes type. Several series of experimental investigations uponthe aforementioned kind of bundle in open circuit section type wind tunnel of subsonic speeds applyingvarious hydrodynamic flow conditions are ran. As a result of these investigations, the correlations and definite dependences of the Nusselt numbers Nu and Euler numbers Eu on the Reynolds number Re of tube bundle were revealed.

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Summarizing of Nusselt numbers and Euler numbers in depending of Reynoldsnumber for the compact tube bundle of small diameter tubes by experimental and numerical methods of researches