報告書番号

T07

タイトル（和文）

閉空間内の温度成層流体の自然対流に関する研究

タイトル（英文）

STUDY OF NATURAL CONVECTION IN CONFINED MEDIA WITH THERMAL STRATIFICATION

概要 （図表や脚注は「報告書全文」に掲載しております）

タンク型高速増殖炉の隔壁（高温プレナムと低温プレナムを分離する構造物）の熱保護方式として中間プレナム方式（高・低温プレナム間にナトリウムの淀み層を形成する方式）を実用化するに際しての課題である閉空間（中間プレナム）内温度分布評価手法の確立を目的とし，液体金属（鉛－ビスマス合金）および水を用いて一連の自然対流実験を行った。鉛直平板の自然対流熱伝達に関する実験データを得るとともに，閉空間内の定常時および過渡時自然対流に対する側壁からの熱の流出入の影響について検討した。さらに，閉空間内自然対流の数値解析法について，実験データに基いて検証を行った。

概要 （英文）

THE INTERMEDIATE PLENUM IN A POOL-TYPE LMFBRIS A STAGNANT LAYER OF THE COOLANT FORMED AT THE BOUNDARY BETWEEN THE HOT AND COLD PLENA WITH A LARGE TEMPERATURE DIFFERENCE. ITS FUNCTION ISTO PROTECT THE MAJOR STRUCTURES AROUND THE PLENUM SEPARATOR STRUCTURE FROM THERMAL LOADING. THE OBJECTIVES OF THE PRESENT STUDY ARE TO ASCERTAIN THE NATURAL CONVESTION HEAT TRANSFER CORRELATION AND ESTABLISH THE ANALYTICAL METHOD FOR THE PREDICTION OF THE TEMPERATURE PROFILE IN THE INTERMEDIATE PLENUM,WHICH IS CHARACTERIZED BY A THERMAL STRATIFICATION.NATURAL CONVECTION HEAT TRANSFER TESTS USING LEAD-BISMUTH ALLOY WERE CONDUCTED TO EVALUATE THE EFFECT OF THERMAL STRATIFICATION ON THE LIQUID-METAL HEAT TRANSFER RATS. ENHANCEMENT OF THE HEAT TRANSFER RATE BY BULK FLUID STRATIFICATION IS CALCULATED FOR THERMALLY STRATIFIED SODIUM. EFFECTS OF HEAT FLOW FROM THE SIDE WALLS ARE EVALUATED FOR THE HEAT TRANSFER AND TEMPERATURE DISTRIBUTION IN A CONFINED MEDIA WITH A HIGH DEGREE OF THERMAL STRATIFICATION. FOLLOWING STATIONARY TESTS,TRANSIENT TESTSSIMULATING A REACTOR CYCLE,IN WATER AND LIQUID METAL WERE CONDUCTED FOR THE PURPOSE OF OBTAINING A BASIC IDEA OF THE TRANSIENT TEMPERATURE PROFILE AFTER SUDDEN COOLING OF THE TOP ROOF OF THE INTERMEDIATE PLENUM. A PRACTICAL METHOD IS PROPOSED TO OBTAIN A STABLE SOLUTION OF NATURAL CONVECTION AT HIGH GRASHOF NUMBER IN THERMALLY STRATIFIED FLUID.

報告者

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