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A new vertical water tunnel with global temperature control and thepossibility for bubble and local heat & mass injection has been designed andconstructed. The new facility offers the possibility to accurately study heatand mass transfer in turbulent multiphase flow (gas volume fraction up to$8\%$) with a Reynolds-number range from $1.5 \times 10^4$ to $3 \times 10^5$in the case of water at room temperature. The tunnel is made of high-gradestainless steel permitting the use of salt solutions in excess of 15$\%$ massfraction. The tunnel has a volume of 300 liters. The tunnel has threeinterchangeable measurement sections of $1$ m height but with different crosssections ($0.3 \times 0.04 m^2$, $0.3 \times 0.06 m^2$, $0.3 \times 0.08 m^2$).The glass vertical measurement sections allow for optical access to the flow,enabling techniques such as laser Doppler anemometry, particle imagevelocimetry, particle tracking velocimetry, and laser-induced fluorescentimaging. Local sensors can be introduced from the top and can be traversedusing a built-in traverse system, allowing for e.g. local temperature,hot-wire, or local phase measurements. Combined with simultaneous velocitymeasurements, the local heat flux in single phase and two phase turbulent flowscan thus be studied quantitatvely and precisely.

Twente Mass and Heat Transfer Water Tunnel: Temperature controlled turbulent multiphase channel flow with heat and mass transfer