The jet impingement boiling heat transfer with ad hoc wall thermal boundary conditions

Enhanced flow boiling heat transfer with fractal-like geometrical structures fabricated by additive manufacturing

“…Impingement cooling systems propel a jet of liquid coolant to impinge directly on a heated surface to cool the surface [7]. Spray cooling uses a spray to expel a mist, or multiple droplets of liquid coolant onto the surface [8].…”

“…The pressure drop due to the gradual contraction, ∆P g, contraction , is then determined by integrating Eq. (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) along the contraction length. The pressure drop is determined to be in the range from 0.1 Pa to 43.9 Pa.…”

“…Evaluating Eq. (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) shows that the uncertainty of h ̅ FB is ±3.2%, and its maximum uncertainty is at ±13.8%.…”

“…In the case of the single-phase heat transfer coefficient, h ̅ SP , its uncertainty is evaluated in the same way as expressed in Eq. (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). Its uncertainty is evaluated to be ±4.4%, with a maximum uncertainty of ±7.6%…”

“…The Levenberg-Marquardt algorithm is employed to determine the coefficients in Eqs. (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) and (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23). This was done with MATLAB as it has an in-built curve fitting function that uses the Levenberg-Marquardt algorithm.…”