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Abstract <p>Various types of passive heat transfer intensifiers are used in channel heat exchangers to increase the heat transfer coefficient. Both insert structures (spirals, twisted tapes, and discrete turbulators) and mechanical or chemical modification of the channel wall (corrugation and deposition of coatings with specified properties) are applied. This paper presents the results of investigation into heat transfer rate at forced circulation of water in a circular channel with spiral intensifiers with hydrophobic coating. The experiments were conducted on a closed circulation circuit at a pressure in the storage vessel of 0.03–0.04 MPa. The test section was a stainless steel tube with length of 2 m, inner diameter of 7.6 mm, and wall thickness of 0.2 mm. Heating was due to electric current flow in the tube wall. The spiral intensifiers have a winding pitch of 4 mm; the fluoroplastic sleeve thickness was 0.9 mm. The experiments were conducted at mass velocities of 35–466 kg/m<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11823_2025_428_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">\({}^{2}\)</EquationSource> <!--JEnTher2502010Zhukov-m1--> </InlineEquation>. The range of heat flux density was <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11823_2025_428_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="129" /> </InlineMediaObject> <EquationSource Format="TEX">\(8000&lt;q&lt;32\,000\)</EquationSource> <!--JEnTher2502010Zhukov-m2--> </InlineEquation> W/m<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11823_2025_428_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">\({}^{2}\)</EquationSource> <!--JEnTher2502010Zhukov-m3--> </InlineEquation>. Measurements of pressure drop across this test section in the regimes of single-phase and two-phase flows were carried out, and the dynamics of pressure drop during formation of two-phase flow at different regime parameters was shown.</p>

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Heat Transfer and Pressure Drop in Water Circulation in Heated Channel with Spiral Intensifiers with Hydrophobic Coating

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • V. E. Zhukov,
  • N. N. Mezentseva

摘要

Abstract

Various types of passive heat transfer intensifiers are used in channel heat exchangers to increase the heat transfer coefficient. Both insert structures (spirals, twisted tapes, and discrete turbulators) and mechanical or chemical modification of the channel wall (corrugation and deposition of coatings with specified properties) are applied. This paper presents the results of investigation into heat transfer rate at forced circulation of water in a circular channel with spiral intensifiers with hydrophobic coating. The experiments were conducted on a closed circulation circuit at a pressure in the storage vessel of 0.03–0.04 MPa. The test section was a stainless steel tube with length of 2 m, inner diameter of 7.6 mm, and wall thickness of 0.2 mm. Heating was due to electric current flow in the tube wall. The spiral intensifiers have a winding pitch of 4 mm; the fluoroplastic sleeve thickness was 0.9 mm. The experiments were conducted at mass velocities of 35–466 kg/m \({}^{2}\) . The range of heat flux density was \(8000<q<32\,000\) W/m \({}^{2}\) . Measurements of pressure drop across this test section in the regimes of single-phase and two-phase flows were carried out, and the dynamics of pressure drop during formation of two-phase flow at different regime parameters was shown.