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In a concentric counter flow heat exchanger, water flows through the inner tube at $25^\circ C$ and leaves at $42^\circ C$. The engine oil enters at $100^\circ C$ and flows in the annular flow passage. The exit temperature of the engine oil is $50^\circ C$. Mass flow rate of water and the engine oil are $1.5 kg/s$ and $1 kg/s$, respectively. The specific heat of water and oil are $4178 J/kg.K$ and $2130 J/kg.K$, respectively. The effectiveness of this heat exchanger is _______
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