In a flow the convection coefficient has a value of 2600 W/m2K. The thermal conductivity of the material is 0.64 W/mK. The temperature difference is 40°C. The value of temperature gradient at the interface is ____________ . (– 162500°C/m) 55. In a flow across a tube bundle the tube OD is 0.75 m. The tube arrangement is staggered with a pitch of 0.15 m normal to the flow and 0.1 m pitch along the flow. The entrance velocity is 10 m/s. The maximum velocity is ____________ . (20m/s)
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