Experimental apparatus for heat transfer of horizontal, air-solids suspension flows and its performance

Abstract

An experimental apparatus was constructed for investigation of heat-transfer characteristics of a horizontal, turbulent air-solids suspension flow. Test section is composed of a development section and a heated section. Each section is made of pipes with an inner diameter of 54.5 mm and has the length of 8 meters, so as to be capable of measuring the local heat transfer in thermally developing/developed regions. The fully developed profiles of flow and thermal variables, such as velocity, mass flux, and temperature, can be measured at a location 140 mm-dia downstream of the heated section by inserting special probes into the suspension flow. For ensuring the reliability of the apparatus and verification of the phenomenological performance of the system, several test runs were carried out with air alone. The measured performance and reliability of the apparatus were satisfactory for purpose of the experiment.

水平式、空気・固体懸濁乱流の熱伝達特性を検討するために実験装置を考案した。試験区間は発達区間と加熱区間から構成されている。熱的な発達中/発達後の領域における局部的熱伝達の測定を可能とするために、各区間は内径54.5mmのパイプから作られ、8mの長さがある。十分に発達した後の、速度、物質流束および温度などの流動と熱的変数のプロフィールを加熱区間の下流140mm径の位置で懸濁流の中に特殊プローブを挿入して測定した。装置の信頼性を確実にし、システムの現象学的性能を立証するために空気単独で数度の試運転を実施した。測定した装置の性能および信頼性は実験の目的には十分であった。