def gravitational_loss_in_circular_tube(temperature=293.15, # Kelvin pressure=101.3, # kPa particle_diameter=10, # µm particle_density=1000, # kg/m^3 tube_diameter=0.01, # m tube_length=0.1, # m incline_angle=60, # degrees from horizontal (0-90) flow_rate=3, # cc/s mean_flow_velocity=False, # 0.1061 # m/s) flow_type='auto', verbose=False): """ Arguments --------- temperature = 293.15, # Kelvin pressure = 101.3, # kPa particle_diameter = 10, # µm particle_density = 1000, # kg/m^3 tube_diameter = 0.01, # m tube_length = 0.1, # m incline_angle = 60, # degrees from horizontal (0-90) flow_rate = 3, # cc/s mean_flow_velocity = False #0.1061 # m/s)""" if not mean_flow_velocity: mean_flow_velocity = _tools_sampling_efficiency.flow_rate2flow_velocity(flow_rate, tube_diameter, verbose=verbose) if flow_type == 'auto': flow_type = _tools_sampling_efficiency.test_flow_type_in_tube(tube_diameter, mean_flow_velocity, temperature, pressure, verbose=verbose) if flow_type == 'laminar': sv = _tools_sampling_efficiency.settling_velocity(temperature, particle_density, particle_diameter, pressure, verbose=verbose) k770 = np.cos(np.pi * incline_angle / 180) * 3 * sv * tube_length / (4 * tube_diameter * mean_flow_velocity) if np.any((k770 ** (2. / 3)) > 1): fract = 0 else: if np.any(k770 ** (2 / 3.) > 1): k771 = 0 else: k771 = np.arcsin(k770 ** (1 / 3.)) # done fract = (1 - (2 / np.pi) * ( 2 * k770 * np.sqrt(1 - k770 ** (2 / 3)) + k771 - (k770 ** (1 / 3) * np.sqrt(1 - k770 ** (2 / 3))))) # done if np.any(fract < 0): fract = 0 elif flow_type == 'turbulent': raise ValueError('Sorry this loss mechanism has not been implemented for turbulent flow') else: raise ValueError('Unknown flow type: %s' % flow_type) if verbose: print('k770: %s' % k770) print('k771: %s' % k771) print('fraction penetrating: %s' % fract) return fract
def inlet_efficiency_isoaxial_horizontal_sharp_edged( temperature=293.15, # Kelvin pressure=101.3, # kPa particle_diameter=15, # µm particle_density=1000, # kg/m^3 inlet_diameter=0.0127, # m inlet_length=0.1, # m sampling_flow_rate=3, # cc/s air_velocity_inlet=False, # m/s ambient_air_speed=25.5, # m/s velocity_ratio=False, # R is 1 for isokinetic, > 1 for subisokinetic verbose=False): """ Inlet efficiency for an isoaxial horizontal sharp-edged inlet: aspiration + transmission (B&W 8-8, 8-14, 8-16, 8-18; W&B 6-8, 6-14, 6-16, 6-18, Hinds 10-7) Temperature 293.15 Kelvin Pressure 101.3 kPa Particle diameter 15 µm Particle density 1000 kg/m^3 Inlet diameter 0.0127 m Inlet length 0.1 m Air velocity in inlet (Vi) 0.05 m/s Velocity ratio (Vw/Vi) 15 Parameters ---------- temperature pressure particle_diameter particle_density inlet_diameter inlet_length air_velocity_inlet velocity_ratio verbose Returns ------- """ if not air_velocity_inlet: air_velocity_inlet = _tools_sampling_efficiency.flow_rate2flow_velocity( sampling_flow_rate, inlet_diameter, verbose=verbose) if not velocity_ratio: velocity_ratio = ambient_air_speed / air_velocity_inlet st_no = _tools_sampling_efficiency.stokes_number(particle_density, particle_diameter, pressure, temperature, air_velocity_inlet, velocity_ratio, inlet_diameter, verbose=verbose) asp_eff = 1 + (velocity_ratio - 1) * (1 - (1 / (1 + (2 + (0.617 / velocity_ratio)) * st_no))) set_vel = _tools_sampling_efficiency.settling_velocity(temperature, particle_density, particle_diameter, pressure, verbose=verbose) grav_param = (inlet_length / air_velocity_inlet) / (inlet_diameter / set_vel) flow_reyno = _tools_sampling_efficiency.flow_reynolds_number( inlet_diameter, air_velocity_inlet, temperature, pressure, verbose=verbose) grav_eff = np.exp( -4.7 * (np.sqrt(grav_param * st_no / np.sqrt(flow_reyno)))**0.75) if velocity_ratio > 1: init_trans_eff = (1 + (velocity_ratio - 1) / (1 + 2.66 / st_no** (2 / 3))) / (1 + (velocity_ratio - 1) / (1 + 0.418 / st_no)) else: init_trans_eff = 1 def vena_contracta_efficiency(): if velocity_ratio < 1: eff = np.exp( -75 * (0.09 * (st_no * (air_velocity_inlet - air_velocity_inlet * velocity_ratio) / (air_velocity_inlet * velocity_ratio))**0.3)**2) else: eff = 1 return eff vena_cont_eff = vena_contracta_efficiency() efficiency = asp_eff * grav_eff * init_trans_eff * vena_cont_eff return efficiency
def gravitational_loss_in_circular_tube( temperature=293.15, # Kelvin pressure=101.3, # kPa particle_diameter=10, # µm particle_density=1000, # kg/m^3 tube_diameter=0.01, # m tube_length=0.1, # m incline_angle=60, # degrees from horizontal (0-90) flow_rate=3, # cc/s mean_flow_velocity=False, # 0.1061 # m/s) flow_type='auto', verbose=False): """ Arguments --------- temperature = 293.15, # Kelvin pressure = 101.3, # kPa particle_diameter = 10, # µm particle_density = 1000, # kg/m^3 tube_diameter = 0.01, # m tube_length = 0.1, # m incline_angle = 60, # degrees from horizontal (0-90) flow_rate = 3, # cc/s mean_flow_velocity = False #0.1061 # m/s)""" if not mean_flow_velocity: mean_flow_velocity = _tools_sampling_efficiency.flow_rate2flow_velocity( flow_rate, tube_diameter, verbose=verbose) if flow_type == 'auto': flow_type = _tools_sampling_efficiency.test_flow_type_in_tube( tube_diameter, mean_flow_velocity, temperature, pressure, verbose=verbose) if flow_type == 'laminar': sv = _tools_sampling_efficiency.settling_velocity(temperature, particle_density, particle_diameter, pressure, verbose=verbose) k770 = np.cos(np.pi * incline_angle / 180) * 3 * sv * tube_length / ( 4 * tube_diameter * mean_flow_velocity) if np.any((k770**(2. / 3)) > 1): fract = 0 else: if np.any(k770**(2 / 3.) > 1): k771 = 0 else: k771 = np.arcsin(k770**(1 / 3.)) # done fract = (1 - (2 / np.pi) * (2 * k770 * np.sqrt(1 - k770**(2 / 3)) + k771 - (k770**(1 / 3) * np.sqrt(1 - k770**(2 / 3))))) # done if np.any(fract < 0): fract = 0 elif flow_type == 'turbulent': raise ValueError( 'Sorry this loss mechanism has not been implemented for turbulent flow' ) else: raise ValueError('Unknown flow type: %s' % flow_type) if verbose: print('k770: %s' % k770) print('k771: %s' % k771) print('fraction penetrating: %s' % fract) return fract
def inlet_efficiency_isoaxial_horizontal_sharp_edged(temperature = 293.15, # Kelvin pressure = 101.3, # kPa particle_diameter = 15, # µm particle_density = 1000, # kg/m^3 inlet_diameter = 0.0127, # m inlet_length = 0.1, # m sampling_flow_rate = 3, # cc/s air_velocity_inlet = False,# m/s ambient_air_speed = 25.5, # m/s velocity_ratio = False, # R is 1 for isokinetic, > 1 for subisokinetic verbose = False ): """ Inlet efficiency for an isoaxial horizontal sharp-edged inlet: aspiration + transmission (B&W 8-8, 8-14, 8-16, 8-18; W&B 6-8, 6-14, 6-16, 6-18, Hinds 10-7) Temperature 293.15 Kelvin Pressure 101.3 kPa Particle diameter 15 µm Particle density 1000 kg/m^3 Inlet diameter 0.0127 m Inlet length 0.1 m Air velocity in inlet (Vi) 0.05 m/s Velocity ratio (Vw/Vi) 15 Parameters ---------- temperature pressure particle_diameter particle_density inlet_diameter inlet_length air_velocity_inlet velocity_ratio verbose Returns ------- """ if not air_velocity_inlet: air_velocity_inlet = _tools_sampling_efficiency.flow_rate2flow_velocity(sampling_flow_rate, inlet_diameter, verbose=verbose) if not velocity_ratio: velocity_ratio = ambient_air_speed/air_velocity_inlet st_no = _tools_sampling_efficiency.stokes_number(particle_density, particle_diameter, pressure, temperature, air_velocity_inlet, velocity_ratio, inlet_diameter, verbose=verbose) asp_eff = 1 + (velocity_ratio - 1) * (1 - (1 / (1 + (2 + (0.617 / velocity_ratio)) * st_no))) set_vel = _tools_sampling_efficiency.settling_velocity(temperature, particle_density, particle_diameter, pressure, verbose=verbose) grav_param =(inlet_length / air_velocity_inlet) / (inlet_diameter / set_vel) flow_reyno = _tools_sampling_efficiency.flow_reynolds_number(inlet_diameter, air_velocity_inlet, temperature, pressure, verbose=verbose) grav_eff = np.exp(-4.7 * (np.sqrt(grav_param * st_no / np.sqrt(flow_reyno)))**0.75) if velocity_ratio > 1: init_trans_eff = (1 + (velocity_ratio - 1) / (1 + 2.66 / st_no**(2/3))) / (1 + (velocity_ratio - 1) / (1 + 0.418 / st_no)) else: init_trans_eff = 1 def vena_contracta_efficiency(): if velocity_ratio < 1: eff = np.exp(-75 * (0.09 * (st_no * (air_velocity_inlet - air_velocity_inlet * velocity_ratio) / (air_velocity_inlet * velocity_ratio))**0.3)**2) else: eff = 1 return eff vena_cont_eff = vena_contracta_efficiency() efficiency = asp_eff * grav_eff * init_trans_eff * vena_cont_eff return efficiency