液-液直接接触式熱交換器に関する実験研究-1-ペンタンの蒸発率〔含質疑応答〕

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Liquid-liquid direct contact heat exchangers have many advantages over conventional multi-tubular type exchangers from the point of view of area of heat exchange and scaling. However, the mechanism of liquid-liquid direct contact heat exchange is so complicated that many experimental researches are going on. Hot water and n-Pentane are mixed and exchanged each other in a acrylic cylinder, 40 mm dia. and 220 mm height, of our experimental apparatus. It is the main object of our research to observe flooding phenomenon of n-Pentane from the cylinder since research reports about the flooding phenomenon are very rare and a portion of liquid n-Pentane still exists in hot water at higher temperature than its boiling point. The evaporation rate of n-Pentane is an important scale of exchanged heat flux between hot water and n-Pentane. We have found evaporation rate of n-Pentane (evaporated n-Pentane/injected n-Pentane) from the measurement of flooding n-Pentane. From the measurement results, the evaporation rate (λ) is expressed by superheated temperature (ΔTW) of hot water and the mass flow rate (φ=n-Pentane/hot water) . Equation of the rate is obtained as follow; λ=1-exp{-[ΔTw-(10∅+2.0)/16∅0.6]} where ΔTW = Tl-Tb Tl: Inlet hot water temperature (K) . Tb : Boiling temperature of water and n-Pentane mixture (K) . φ : Mass flow rate (n-Pentane/hot water) . The equation is in accord with the experimental results in all superheated temperature region at hot water flow of 8.33×10-6 (m3/s) . And it differs about 5-10% at hot water flow of 16.7×10-6 (m3/s) . The experimental equation can be adopted to estimate evaporation rate, and the experimental process is acceptable to observe the flooding phenomenon in Liquid-Liquid Direct Contanct Heat Exchange.
公益社団法人日本マリンエンジニアリング学会の論文

液-液直接接触式熱交換器に関する実験研究-1-ペンタンの蒸発率〔含質疑応答〕

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液-液直接接触式熱交換器に関する実験研究-1-ペンタンの蒸発率〔含 質疑応答〕

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液-液直接接触式熱交換器に関する実験研究-1-ペンタンの蒸発率〔含質疑応答〕